diff --git a/reactos/include/debug.h b/reactos/include/debug.h
index 5e5b654d049..6d29b2f9c78 100644
--- a/reactos/include/debug.h
+++ b/reactos/include/debug.h
@@ -93,7 +93,7 @@
 #error Unsupported architecture.
 #endif
 
-#ifndes KEBUGCHECK
+#ifndef KEBUGCHECK
 #define KEBUGCHECK(a) DbgPrint("KeBugCheck (0x%X) at %s:%i\n", a, __FILE__,__LINE__), KeBugCheck(a)
 #define KEBUGCHECKEX(a,b,c,d,e) DbgPrint("KeBugCheckEx (0x%X, 0x%X, 0x%X, 0x%X, 0x%X) at %s:%i\n", a, b, c, d, e, __FILE__,__LINE__), KeBugCheckEx(a,b,c,d,e)
 #endif