diff --git a/src/osd/modules/debugger/osx/debugosx.h b/src/osd/modules/debugger/osx/debugosx.h
index b07aa3a088d..9d48402c032 100644
--- a/src/osd/modules/debugger/osx/debugosx.h
+++ b/src/osd/modules/debugger/osx/debugosx.h
@@ -9,6 +9,8 @@
 #ifndef __SDL_DEBUGOSX__
 #define __SDL_DEBUGOSX__
 
+#define __ASSERT_MACROS_DEFINE_VERSIONS_WITHOUT_UNDERSCORES 0
+
 // make sure this comes first
 #include <AvailabilityMacros.h>
 
diff --git a/src/osd/sdl/sdlmain.cpp b/src/osd/sdl/sdlmain.cpp
index a819c409467..ce8454b97db 100644
--- a/src/osd/sdl/sdlmain.cpp
+++ b/src/osd/sdl/sdlmain.cpp
@@ -18,6 +18,7 @@
 #endif
 #endif
 #ifdef SDLMAME_MACOSX
+#define __ASSERT_MACROS_DEFINE_VERSIONS_WITHOUT_UNDERSCORES 0
 #include <Carbon/Carbon.h>
 #endif
 #endif