diff --git a/include/internal/catch_tostring.hpp b/include/internal/catch_tostring.hpp
index b6802af9..4d2be7b1 100644
--- a/include/internal/catch_tostring.hpp
+++ b/include/internal/catch_tostring.hpp
@@ -73,6 +73,7 @@ inline std::string toString( const std::string& value ) {
     return "\"" + value + "\"";
 }
 
+#ifdef wchar_t
 inline std::string toString( const std::wstring& value ) {
     std::ostringstream oss;
     oss << "\"";
@@ -81,6 +82,7 @@ inline std::string toString( const std::wstring& value ) {
     oss << "\"";
     return oss.str();
 }
+#endif
 
 inline std::string toString( const char* const value ) {
     return value ? Catch::toString( std::string( value ) ) : std::string( "{null string}" );
diff --git a/single_include/catch.hpp b/single_include/catch.hpp
index cd5bd053..f5918910 100644
--- a/single_include/catch.hpp
+++ b/single_include/catch.hpp
@@ -545,6 +545,7 @@ inline std::string toString( const std::string& value ) {
     return "\"" + value + "\"";
 }
 
+#ifdef wchar_t
 inline std::string toString( const std::wstring& value ) {
     std::ostringstream oss;
     oss << "\"";
@@ -553,6 +554,7 @@ inline std::string toString( const std::wstring& value ) {
     oss << "\"";
     return oss.str();
 }
+#endif
 
 inline std::string toString( const char* const value ) {
     return value ? Catch::toString( std::string( value ) ) : std::string( "{null string}" );