diff --git a/include/internal/catch_capture.hpp b/include/internal/catch_capture.hpp
index b7ffb230..705e4ff7 100644
--- a/include/internal/catch_capture.hpp
+++ b/include/internal/catch_capture.hpp
@@ -658,16 +658,16 @@ inline bool isTrue
 
 ///////////////////////////////////////////////////////////////////////////////
 #define INTERNAL_CATCH_ACCEPT_EXPR( expr, stopOnFailure ) \
-    if( Catch::ResultAction::Value action = Catch::Hub::getResultCapture().acceptExpression( expr )  ) \
+    if( Catch::ResultAction::Value internal_catch_action = Catch::Hub::getResultCapture().acceptExpression( expr )  ) \
     { \
-        if( action == Catch::ResultAction::DebugFailed ) BreakIntoDebugger(); \
+        if( internal_catch_action == Catch::ResultAction::DebugFailed ) BreakIntoDebugger(); \
         if( Catch::isTrue( stopOnFailure ) ) throw Catch::TestFailureException(); \
     }
 
 ///////////////////////////////////////////////////////////////////////////////
 #define INTERNAL_CATCH_TEST( expr, isNot, stopOnFailure, macroName ) \
     INTERNAL_CATCH_ACCEPT_EXPR( ( Catch::ResultBuilder( __FILE__, __LINE__, macroName, #expr, isNot )->*expr ), stopOnFailure ); \
-    if( Catch::isTrue( false ) ){ bool dummyResult = ( expr ); Catch::isTrue( dummyResult ); }
+    if( Catch::isTrue( false ) ){ bool internal_catch_dummyResult = ( expr ); Catch::isTrue( internal_catch_dummyResult ); }
 
 ///////////////////////////////////////////////////////////////////////////////
 #define INTERNAL_CATCH_NO_THROW( expr, stopOnFailure, macroName ) \
@@ -676,9 +676,9 @@ inline bool isTrue
         expr; \
         INTERNAL_CATCH_ACCEPT_EXPR( Catch::ResultBuilder( __FILE__, __LINE__, macroName, #expr ).setResultType( Catch::ResultWas::Ok ), stopOnFailure ); \
     } \
-    catch( std::exception& ex ) \
+    catch( std::exception& internal_catch_exception ) \
     { \
-        INTERNAL_CATCH_ACCEPT_EXPR( ( Catch::ResultBuilder( __FILE__, __LINE__, macroName, #expr ) << ex.what() ).setResultType( Catch::ResultWas::ThrewException ), stopOnFailure ); \
+        INTERNAL_CATCH_ACCEPT_EXPR( ( Catch::ResultBuilder( __FILE__, __LINE__, macroName, #expr ) << internal_catch_exception.what() ).setResultType( Catch::ResultWas::ThrewException ), stopOnFailure ); \
     } \
     catch( ... ) \
     { \