diff --git a/ntoskrnl/io/iomgr/driver.c b/ntoskrnl/io/iomgr/driver.c
index adbb14ba445..61ac27ed25b 100644
--- a/ntoskrnl/io/iomgr/driver.c
+++ b/ntoskrnl/io/iomgr/driver.c
@@ -11,7 +11,7 @@
 /* INCLUDES *******************************************************************/
 
 #include <ntoskrnl.h>
-// #define NDEBUG
+#define NDEBUG
 #include <debug.h>
 
 /* GLOBALS ********************************************************************/