--- a/src/globals.h
+++ b/src/globals.h
@@ -876,7 +876,7 @@ EXTERN int Exec_reg INIT(= FALSE);	/* TR
 EXTERN int no_mapping INIT(= FALSE);	/* currently no mapping allowed */
 EXTERN int no_zero_mapping INIT(= 0);	/* mapping zero not allowed */
 EXTERN int allow_keys INIT(= FALSE);	/* allow key codes when no_mapping
-					     * is set */
+					 * is set */
 EXTERN int no_u_sync INIT(= 0);		/* Don't call u_sync() */
 
 EXTERN int restart_edit INIT(= 0);	/* call edit when next cmd finished */
@@ -1252,6 +1252,14 @@ EXTERN guint32	gtk_socket_id INIT(= 0);
 EXTERN int	echo_wid_arg INIT(= FALSE);	/* --echo-wid argument */
 #endif
 
+#ifdef FEAT_GUI_W32
+/*
+ * The value of the --windowid argument.
+ * For embedding gvim inside another application.
+ */
+EXTERN int	win_socket_id INIT(= 0);
+#endif
+
 #if defined(FEAT_CLIENTSERVER) || defined(FEAT_EVAL)
 EXTERN int	typebuf_was_filled INIT(= FALSE); /* received text from client
 						     or from feedkeys() */