diff --git a/cmd.c b/cmd.c
index 69381973..2a9a8755 100644
--- a/cmd.c
+++ b/cmd.c
@@ -1,4 +1,4 @@
-/* $Id: cmd.c,v 1.102 2009-07-15 17:45:29 nicm Exp $ */
+/* $Id: cmd.c,v 1.103 2009-07-15 17:46:09 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -555,7 +555,7 @@ cmd_find_window(struct cmd_ctx *ctx, const char *arg, struct session **sp)
 	 */
 	if ((s = cmd_current_session(ctx)) == NULL) {
 		ctx->error(ctx, "can't establish current session");
-		return (NULL);
+		return (-1);
 	}
 
 	/* A NULL argument means the current session and window. */