Index: quickjs.c
--- quickjs.c.orig
+++ quickjs.c
@@ -1705,7 +1705,7 @@ static size_t js_def_malloc_usable_size(const void *pt
     return malloc_usable_size((void *)ptr);
 #else
     /* change this to `return 0;` if compilation fails */
-    return malloc_usable_size((void *)ptr);
+    return 0;
 #endif
 }
 
