diff --git a/dll/cpl/telephon/telephon.rc b/dll/cpl/telephon/telephon.rc
index 44ce43dc3f7..c08e4e65736 100644
--- a/dll/cpl/telephon/telephon.rc
+++ b/dll/cpl/telephon/telephon.rc
@@ -1,4 +1,5 @@
 #include <windef.h>
+#include <winuser.h>
 
 #include "resource.h"
 
diff --git a/sdk/include/reactos/manifest_hosted.rc b/sdk/include/reactos/manifest_hosted.rc
index 05604d44c78..46d0cb27d98 100644
--- a/sdk/include/reactos/manifest_hosted.rc
+++ b/sdk/include/reactos/manifest_hosted.rc
@@ -1 +1,6 @@
+
+#ifndef RT_MANIFEST
+#error please include winuser.h before including me!
+#endif
+
 123 RT_MANIFEST "manifest.xml"