diff --git a/Libraries/LibC/stdlib.h b/Libraries/LibC/stdlib.h
index a4cb21a4104..7bd91960d0a 100644
--- a/Libraries/LibC/stdlib.h
+++ b/Libraries/LibC/stdlib.h
@@ -4,7 +4,7 @@
 #include <sys/cdefs.h>
 #include <sys/types.h>
 
-[[nodiscard]] bool __generate_unique_filename(char* pattern);
+__attribute__((warn_unused_result)) bool __generate_unique_filename(char* pattern);
 
 __BEGIN_DECLS