diff --git a/luna/Check.h b/luna/Check.h
index 1e24fb66..4327a2be 100644
--- a/luna/Check.h
+++ b/luna/Check.h
@@ -3,7 +3,9 @@
 
 extern _noreturn bool __check_failed(const char* file, const char* line, const char* func, const char* expr);
 
+#ifndef STRINGIZE_VALUE_OF
 #define STRINGIZE(x) #x
 #define STRINGIZE_VALUE_OF(x) STRINGIZE(x)
+#endif
 
 #define check(expr) (expr) || __check_failed(__FILE__, STRINGIZE_VALUE_OF(__LINE__), __PRETTY_FUNCTION__, #expr)