diff --git a/docs/tostring.md b/docs/tostring.md
index f961ccc1..05a6b79b 100644
--- a/docs/tostring.md
+++ b/docs/tostring.md
@@ -25,7 +25,7 @@ If you don't want to provide an ```operator <<``` overload, or you want to conve
 namespace Catch {
 	template<>
     struct StringMaker<T> {
-    	std::string operator()( T const& value ) {
+    	static std::string convert( T const& value ) {
         	return convertMyTypeToString( value );
         }
     };
diff --git a/include/internal/catch_approx.hpp b/include/internal/catch_approx.hpp
index 9c974f6c..4235d0bc 100644
--- a/include/internal/catch_approx.hpp
+++ b/include/internal/catch_approx.hpp
@@ -128,7 +128,7 @@ namespace Detail {
 
 template<>
 struct StringMaker<Catch::Detail::Approx> {
-    std::string operator()(Catch::Detail::Approx const& value) {
+    static std::string convert(Catch::Detail::Approx const& value) {
         return value.toString();
     }
 };
diff --git a/include/internal/catch_tostring.h b/include/internal/catch_tostring.h
index 6a20f9ef..91fa9ed9 100644
--- a/include/internal/catch_tostring.h
+++ b/include/internal/catch_tostring.h
@@ -61,17 +61,19 @@ namespace Catch {
     template <typename T>
     struct StringMaker {
         template <typename Fake = T>
+        static
         typename std::enable_if<::Catch::Detail::IsStreamInsertable<Fake>::value, std::string>::type
-            operator()(const Fake& t) {
-            std::stringstream sstr;
-            sstr << t;
-            return sstr.str();
+            convert(const Fake& t) {
+                std::stringstream sstr;
+                sstr << t;
+                return sstr.str();
         }
 
         template <typename Fake = T>
+        static
         typename std::enable_if<!::Catch::Detail::IsStreamInsertable<Fake>::value, std::string>::type
-            operator()(const Fake&) {
-            return "{?}";
+            convert(const Fake&) {
+                return "{?}";
         }
     };
 
@@ -83,7 +85,7 @@ namespace Catch {
         // Should be preferably called fully qualified, like ::Catch::Detail::stringify
         template <typename T>
         std::string stringify(const T& e) {
-            return ::Catch::StringMaker<typename std::remove_cv<typename std::remove_reference<T>::type>::type>{}(e);
+            return ::Catch::StringMaker<typename std::remove_cv<typename std::remove_reference<T>::type>::type>::convert(e);
         }
 
     } // namespace Detail
@@ -93,110 +95,110 @@ namespace Catch {
 
     template<>
     struct StringMaker<std::string> {
-        std::string operator()(const std::string& str);
+        static std::string convert(const std::string& str);
     };
     template<>
     struct StringMaker<std::wstring> {
-        std::string operator()(const std::wstring& wstr);
+        static std::string convert(const std::wstring& wstr);
     };
 
     template<>
     struct StringMaker<char const *> {
-        std::string operator()(char const * str);
+        static std::string convert(char const * str);
     };
     template<>
     struct StringMaker<char *> {
-        std::string operator()(char * str);
+        static std::string convert(char * str);
     };
     template<>
     struct StringMaker<wchar_t const *> {
-        std::string operator()(wchar_t const * str);
+        static std::string convert(wchar_t const * str);
     };
     template<>
     struct StringMaker<wchar_t *> {
-        std::string operator()(wchar_t * str);
+        static std::string convert(wchar_t * str);
     };
 
     template<int SZ>
     struct StringMaker<char[SZ]> {
-        std::string operator()(const char* str) {
+        static std::string convert(const char* str) {
             return ::Catch::Detail::stringify(std::string{ str });
         }
     };
     template<int SZ>
     struct StringMaker<signed char[SZ]> {
-        std::string operator()(const char* str) {
+        static std::string convert(const char* str) {
             return ::Catch::Detail::stringify(std::string{ str });
         }
     };
     template<int SZ>
     struct StringMaker<unsigned char[SZ]> {
-        std::string operator()(const char* str) {
+        static std::string convert(const char* str) {
             return ::Catch::Detail::stringify(std::string{ str });
         }
     };
 
     template<>
     struct StringMaker<int> {
-        std::string operator()(int value);
+        static std::string convert(int value);
     };
     template<>
     struct StringMaker<long> {
-        std::string operator()(long value);
+        static std::string convert(long value);
     };
     template<>
     struct StringMaker<long long> {
-        std::string operator()(long long value);
+        static std::string convert(long long value);
     };
     template<>
     struct StringMaker<unsigned int> {
-        std::string operator()(unsigned int value);
+        static std::string convert(unsigned int value);
     };
     template<>
     struct StringMaker<unsigned long> {
-        std::string operator()(unsigned long value);
+        static std::string convert(unsigned long value);
     };
     template<>
     struct StringMaker<unsigned long long> {
-        std::string operator()(unsigned long long value);
+        static std::string convert(unsigned long long value);
     };
 
     template<>
     struct StringMaker<bool> {
-        std::string operator()(bool b);
+        static std::string convert(bool b);
     };
 
     template<>
     struct StringMaker<char> {
-        std::string operator()(char c);
+        static std::string convert(char c);
     };
     template<>
     struct StringMaker<signed char> {
-        std::string operator()(signed char c);
+        static std::string convert(signed char c);
     };
     template<>
     struct StringMaker<unsigned char> {
-        std::string operator()(unsigned char c);
+        static std::string convert(unsigned char c);
     };
 
     template<>
     struct StringMaker<std::nullptr_t> {
-        std::string operator()(std::nullptr_t);
+        static std::string convert(std::nullptr_t);
     };
 
     template<>
     struct StringMaker<float> {
-        std::string operator()(float value);
+        static std::string convert(float value);
     };
     template<>
     struct StringMaker<double> {
-        std::string operator()(double value);
+        static std::string convert(double value);
     };
 
     template <typename T>
     struct StringMaker<T*> {
         template <typename U>
-        std::string operator()(U* p) {
+        static std::string convert(U* p) {
             if (p) {
                 return ::Catch::Detail::rawMemoryToString(p);
             } else {
@@ -207,7 +209,7 @@ namespace Catch {
 
     template <typename R, typename C>
     struct StringMaker<R C::*> {
-        std::string operator()(R C::* p) {
+        static std::string convert(R C::* p) {
             if (p) {
                 return ::Catch::Detail::rawMemoryToString(p);
             } else {
@@ -233,7 +235,7 @@ namespace Catch {
 
     template<typename T, typename Allocator>
     struct StringMaker<std::vector<T, Allocator> > {
-        std::string operator()( std::vector<T,Allocator> const& v ) {
+        static std::string convert( std::vector<T,Allocator> const& v ) {
             return ::Catch::Detail::rangeToString( v.begin(), v.end() );
         }
     };
@@ -241,7 +243,7 @@ namespace Catch {
     // === Pair ===
     template<typename T1, typename T2>
     struct StringMaker<std::pair<T1, T2> > {
-        std::string operator()(const std::pair<T1, T2>& pair) {
+        static std::string convert(const std::pair<T1, T2>& pair) {
             std::ostringstream oss;
             oss << "{ "
                 << ::Catch::Detail::stringify(pair.first)
@@ -281,7 +283,7 @@ namespace Catch {
 
     template<typename ...Types>
     struct StringMaker<std::tuple<Types...>> {
-        std::string operator()(const std::tuple<Types...>& tuple) {
+        static std::string convert(const std::tuple<Types...>& tuple) {
             std::ostringstream os;
             os << '{';
             Detail::TupleElementPrinter<std::tuple<Types...>>::print(tuple, os);
@@ -293,7 +295,7 @@ namespace Catch {
 
     template<typename T>
     struct EnumStringMaker {
-        std::string operator()(const T& t) {
+        static std::string convert(const T& t) {
             return ::Catch::Detail::stringify(static_cast<typename std::underlying_type<T>::type>(t));
         }
     };
@@ -301,15 +303,15 @@ namespace Catch {
 #ifdef __OBJC__
     template<>
     struct StringMaker<NSString const *> {
-        std::string operator()(NSString const* const& nsstring);
+        static std::string convert(NSString const* const& nsstring);
     };
     template<>
     struct StringMaker<NSString * CATCH_ARC_STRONG> {
-        std::string operator()(NSString * CATCH_ARC_STRONG const& nsstring);
+        static std::string convert(NSString * CATCH_ARC_STRONG const& nsstring);
     };
     template<>
     struct StringMaker<NSObject *> {
-        std::string operator()(NSObject* const& nsObject);
+        static std::string convert(NSObject* const& nsObject);
     };
 #endif
 
diff --git a/include/internal/catch_tostring.hpp b/include/internal/catch_tostring.hpp
index 06046095..03881249 100644
--- a/include/internal/catch_tostring.hpp
+++ b/include/internal/catch_tostring.hpp
@@ -76,7 +76,7 @@ std::string fpToString( T value, int precision ) {
 //
 //// ======================================================= ////
 
-std::string StringMaker<std::string>::operator()(const std::string& str) {
+std::string StringMaker<std::string>::convert(const std::string& str) {
     if (!getCurrentContext().getConfig()->showInvisibles()) {
         return '"' + str + '"';
     }
@@ -99,7 +99,7 @@ std::string StringMaker<std::string>::operator()(const std::string& str) {
     return s;
 }
 
-std::string StringMaker<std::wstring>::operator()(const std::wstring& wstr) {
+std::string StringMaker<std::wstring>::convert(const std::wstring& wstr) {
     std::string s;
     s.reserve(wstr.size());
     for (auto c : wstr) {
@@ -108,28 +108,28 @@ std::string StringMaker<std::wstring>::operator()(const std::wstring& wstr) {
     return ::Catch::Detail::stringify(s);
 }
 
-std::string StringMaker<char const*>::operator()(char const* str) {
+std::string StringMaker<char const*>::convert(char const* str) {
     if (str) {
         return ::Catch::Detail::stringify(std::string{ str });
     } else {
         return{ "{null string}" };
     }
 }
-std::string StringMaker<char*>::operator()(char* str) {
+std::string StringMaker<char*>::convert(char* str) {
     if (str) {
         return ::Catch::Detail::stringify(std::string{ str });
     } else {
         return{ "{null string}" };
     }
 }
-std::string StringMaker<wchar_t const*>::operator()(wchar_t const * str) {
+std::string StringMaker<wchar_t const*>::convert(wchar_t const * str) {
     if (str) {
         return ::Catch::Detail::stringify(std::wstring{ str });
     } else {
         return{ "{null string}" };
     }
 }
-std::string StringMaker<wchar_t *>::operator()(wchar_t * str) {
+std::string StringMaker<wchar_t *>::convert(wchar_t * str) {
     if (str) {
         return ::Catch::Detail::stringify(std::wstring{ str });
     } else {
@@ -138,13 +138,13 @@ std::string StringMaker<wchar_t *>::operator()(wchar_t * str) {
 }
 
 
-std::string StringMaker<int>::operator()(int value) {
+std::string StringMaker<int>::convert(int value) {
     return ::Catch::Detail::stringify(static_cast<long long>(value));
 }
-std::string StringMaker<long>::operator()(long value) {
+std::string StringMaker<long>::convert(long value) {
     return ::Catch::Detail::stringify(static_cast<long long>(value));
 }
-std::string StringMaker<long long>::operator()(long long value) {
+std::string StringMaker<long long>::convert(long long value) {
     std::ostringstream oss;
     oss << value;
     if (value > Detail::hexThreshold) {
@@ -153,13 +153,13 @@ std::string StringMaker<long long>::operator()(long long value) {
     return oss.str();
 }
 
-std::string StringMaker<unsigned int>::operator()(unsigned int value) {
+std::string StringMaker<unsigned int>::convert(unsigned int value) {
     return ::Catch::Detail::stringify(static_cast<unsigned long long>(value));
 }
-std::string StringMaker<unsigned long>::operator()(unsigned long value) {
+std::string StringMaker<unsigned long>::convert(unsigned long value) {
     return ::Catch::Detail::stringify(static_cast<unsigned long long>(value));
 }
-std::string StringMaker<unsigned long long>::operator()(unsigned long long value) {
+std::string StringMaker<unsigned long long>::convert(unsigned long long value) {
     std::ostringstream oss;
     oss << value;
     if (value > Detail::hexThreshold) {
@@ -169,11 +169,11 @@ std::string StringMaker<unsigned long long>::operator()(unsigned long long value
 }
 
 
-std::string StringMaker<bool>::operator()(bool b) {
+std::string StringMaker<bool>::convert(bool b) {
     return b ? "true" : "false";
 }
 
-std::string StringMaker<char>::operator()(char value) {
+std::string StringMaker<char>::convert(char value) {
     if (value == '\r') {
         return "'\\r'";
     } else if (value == '\f') {
@@ -190,37 +190,37 @@ std::string StringMaker<char>::operator()(char value) {
         return chstr;
     }
 }
-std::string StringMaker<signed char>::operator()(signed char c) {
+std::string StringMaker<signed char>::convert(signed char c) {
     return ::Catch::Detail::stringify(static_cast<char>(c));
 }
-std::string StringMaker<unsigned char>::operator()(unsigned char c) {
+std::string StringMaker<unsigned char>::convert(unsigned char c) {
     return ::Catch::Detail::stringify(static_cast<char>(c));
 }
 
-std::string StringMaker<std::nullptr_t>::operator()(std::nullptr_t) {
+std::string StringMaker<std::nullptr_t>::convert(std::nullptr_t) {
     return "nullptr";
 }
 
-std::string StringMaker<float>::operator()(float value) {
+std::string StringMaker<float>::convert(float value) {
     return fpToString(value, 5) + 'f';
 }
-std::string StringMaker<double>::operator()(double value) {
+std::string StringMaker<double>::convert(double value) {
     return fpToString(value, 10);
 }
 
 
 #ifdef __OBJC__
-std::string StringMaker<NSString const *>::operator()(NSString const * const& nsstring) {
+std::string StringMaker<NSString const *>::convert(NSString const * const& nsstring) {
     if (!nsstring)
         return "nil";
     return "@" + toString([nsstring UTF8String]);
 }
-std::string StringMaker<NSString * CATCH_ARC_STRONG>::operator()(NSString * CATCH_ARC_STRONG const& nsstring) {
+std::string StringMaker<NSString * CATCH_ARC_STRONG>::convert(NSString * CATCH_ARC_STRONG const& nsstring) {
     if (!nsstring)
         return "nil";
     return "@" + toString([nsstring UTF8String]);
 }
-std::string StringMaker<NSObject *>::operator()(NSObject * const& nsObject) {
+std::string StringMaker<NSObject *>::convert(NSObject * const& nsObject) {
     return ::Catch::Detail::stringify([nsObject description]);
 }
 #endif
diff --git a/projects/SelfTest/ToStringWhich.cpp b/projects/SelfTest/ToStringWhich.cpp
index 8bd1b6f9..fc658a7a 100644
--- a/projects/SelfTest/ToStringWhich.cpp
+++ b/projects/SelfTest/ToStringWhich.cpp
@@ -22,13 +22,13 @@ std::ostream& operator<<(std::ostream& os, const has_maker_and_operator&) {
 namespace Catch {
     template<>
     struct StringMaker<has_maker> {
-        std::string operator()( const has_maker& ) {
+        static std::string convert( const has_maker& ) {
             return "StringMaker<has_maker>";
         }
     };
     template<>
     struct StringMaker<has_maker_and_operator> {
-        std::string operator()( const has_maker_and_operator& ) {
+        static std::string convert( const has_maker_and_operator& ) {
             return "StringMaker<has_maker_and_operator>";
         }
     };