diff --git a/.qubesbuilder b/.qubesbuilder
index b67d42a..9b0d80f 100644
--- a/.qubesbuilder
+++ b/.qubesbuilder
@@ -12,3 +12,9 @@ vm:
   archlinux:
     build:
     - archlinux
+  windows:
+    build:
+    - dummy
+    inc:
+    - include/qubes-gui-protocol.h
+    - include/qubes-xorg-tray-defs.h
diff --git a/include/qubes-gui-protocol.h b/include/qubes-gui-protocol.h
index 1bf5fcf..2443c97 100644
--- a/include/qubes-gui-protocol.h
+++ b/include/qubes-gui-protocol.h
@@ -57,13 +57,12 @@
  *    can safely unmap a window's grants
  */
 
-
-#ifdef WINNT
-typedef unsigned __int32 uint32_t;
+#ifdef _WIN32
+// TODO: fix properly for Windows
+#define __attribute__(x)
 #endif
-#ifndef WINNT
+
 #include <stdint.h>
-#endif
 /* version of protocol described in this file, used as gui-daemon protocol
  * version; specific agent defines own version which them support */
 #define QUBES_GUID_PROTOCOL_VERSION_MAJOR 1