diff --git a/include/internal/catch_assertionresult.h b/include/internal/catch_assertionresult.h
index 5d6c86d1..39958498 100644
--- a/include/internal/catch_assertionresult.h
+++ b/include/internal/catch_assertionresult.h
@@ -39,7 +39,7 @@ namespace Catch {
 
     struct AssertionInfo
     {
-        AssertionInfo() {}
+        AssertionInfo();
         AssertionInfo(  char const * _macroName,
                         SourceLineInfo const& _lineInfo,
                         char const * _capturedExpression,
diff --git a/include/internal/catch_assertionresult.hpp b/include/internal/catch_assertionresult.hpp
index 2fa3373d..9a9fce63 100644
--- a/include/internal/catch_assertionresult.hpp
+++ b/include/internal/catch_assertionresult.hpp
@@ -13,6 +13,8 @@
 namespace Catch {
 
 
+    AssertionInfo::AssertionInfo():macroName(""), capturedExpression(""), resultDisposition(ResultDisposition::Flags::Normal), secondArg(""){}
+
     AssertionInfo::AssertionInfo(   char const * _macroName,
                                     SourceLineInfo const& _lineInfo,
                                     char const * _capturedExpression,
diff --git a/include/internal/catch_test_spec_parser.hpp b/include/internal/catch_test_spec_parser.hpp
index 05bdcf4c..055bf1dc 100644
--- a/include/internal/catch_test_spec_parser.hpp
+++ b/include/internal/catch_test_spec_parser.hpp
@@ -30,7 +30,7 @@ namespace Catch {
         ITagAliasRegistry const* m_tagAliases;
 
     public:
-        TestSpecParser( ITagAliasRegistry const& tagAliases ) : m_tagAliases( &tagAliases ) {}
+        TestSpecParser( ITagAliasRegistry const& tagAliases ) :m_mode(None), m_exclusion(false), m_start(0), m_pos(0), m_tagAliases( &tagAliases ) {}
 
         TestSpecParser& parse( std::string const& arg ) {
             m_mode = None;