diff --git a/reactos/drivers/ksfilter/swenum/precomp.h b/reactos/drivers/ksfilter/swenum/precomp.h
index 4b0b952380e..6a357ef0b97 100644
--- a/reactos/drivers/ksfilter/swenum/precomp.h
+++ b/reactos/drivers/ksfilter/swenum/precomp.h
@@ -2,6 +2,7 @@
 #define PRECOMP_H__
 
 #include <ntddk.h>
+#include <windef.h>
 #include <ks.h>
 #include <swenum.h>
 #include <debug.h>