diff --git a/dtool/src/dtoolbase/dtoolbase_cc.h b/dtool/src/dtoolbase/dtoolbase_cc.h
index d33849d636..06f7ede646 100644
--- a/dtool/src/dtoolbase/dtoolbase_cc.h
+++ b/dtool/src/dtoolbase/dtoolbase_cc.h
@@ -124,7 +124,7 @@ typedef ios::seekdir ios_seekdir;
 #if __has_extension(cxx_constexpr)
 #define CONSTEXPR constexpr
 #endif
-#elif defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7))
+#elif defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7)) && (__cplusplus >= 201103L)
 #define CONSTEXPR constexpr
 #else
 #define CONSTEXPR INLINE