diff --git a/reactos/lib/sdk/crt/wine/heap.c b/reactos/lib/sdk/crt/wine/heap.c
index 89c13136c52..545070791b1 100644
--- a/reactos/lib/sdk/crt/wine/heap.c
+++ b/reactos/lib/sdk/crt/wine/heap.c
@@ -27,6 +27,7 @@
 #include <stdlib.h>
 #include <internal/mtdll.h>
 
+#define NDEBUG
 #include <debug.h>
 
 /* MT */