diff --git a/reactos/dll/win32/syssetup/install.c b/reactos/dll/win32/syssetup/install.c
index e125ff9dad6..933acb5e736 100644
--- a/reactos/dll/win32/syssetup/install.c
+++ b/reactos/dll/win32/syssetup/install.c
@@ -49,6 +49,7 @@
 #include "globals.h"
 #include "resource.h"
 
+#define NDEBUG
 #include <debug.h>
 
 DWORD WINAPI