diff --git a/os/xdmcp.c b/os/xdmcp.c
index bc5a70706..b265db338 100644
--- a/os/xdmcp.c
+++ b/os/xdmcp.c
@@ -19,6 +19,10 @@
 
 #ifdef WIN32
 #include <X11/Xwinsock.h>
+#define XSERV_t
+#define TRANS_SERVER
+#define TRANS_REOPEN
+#include <X11/Xtrans/Xtrans.h>
 #endif
 
 #include <X11/Xos.h>