diff --git a/optional.hpp b/optional.hpp
index a963ede..c5b0e6e 100644
--- a/optional.hpp
+++ b/optional.hpp
@@ -28,8 +28,12 @@
 #define TL_OPTIONAL_GCC49
 #endif
 
-#if (defined(__GNUC__) && __GNUC__ == 5 && __GNUC_MINOR__ == 0)
-#define TL_OPTIONAL_GCC50
+template <int> struct TC;
+TC<__GNUC__> debug_1;
+TC<__GNUC_MINOR__> debug_2;
+
+#if (defined(__GNUC__) && __GNUC__ == 5 && __GNUC_MINOR__ <= 4)
+#define TL_OPTIONAL_GCC54
 #endif
 
 #if (defined(__GNUC__) && __GNUC__ == 4 && __GNUC_MINOR__ <= 9)