diff --git a/cmd-queue.c b/cmd-queue.c
index 52674442..17992a37 100644
--- a/cmd-queue.c
+++ b/cmd-queue.c
@@ -163,7 +163,7 @@ cmdq_guard(struct cmd_q *cmdq, const char *guard)
 		return;
 
 	evbuffer_add_printf(c->stdout_data, "%%%s %ld %u\n", guard,
-	    cmdq->time, cmdq->number);
+	    (long) cmdq->time, cmdq->number);
 	server_push_stdout(c);
 }