diff --git a/src/cmdlib.h b/src/cmdlib.h
index 66747415a..f6f0e6ad8 100644
--- a/src/cmdlib.h
+++ b/src/cmdlib.h
@@ -5,6 +5,7 @@
 
 
 #include "doomtype.h"
+#include "doomdef.h"
 
 #include <stdio.h>
 #include <string.h>