diff --git a/LibC/assert.h b/LibC/assert.h
index 546dcc90a7..25ea654db6 100644
--- a/LibC/assert.h
+++ b/LibC/assert.h
@@ -4,7 +4,7 @@
 
 __BEGIN_DECLS
 
-void __assertion_failed(const char* msg, const char* file, unsigned line, const char* func) __NORETURN;
+void __assertion_failed(const char* msg, const char* file, unsigned line, const char* func) __attribute__ ((noreturn));
 
 #define assert(expr) ((expr) ? (void)0 : __assertion_failed(#expr, __FILE__, __LINE__, __PRETTY_FUNCTION__))
 #define CRASH() do { asm volatile("ud2"); } while(0)