diff --git a/sysutils/tmux/files/patch-spawn.c b/sysutils/tmux/files/patch-spawn.c
new file mode 100644
index 0000000000..f6f61e9cf0
--- /dev/null
+++ b/sysutils/tmux/files/patch-spawn.c
@@ -0,0 +1,11 @@
+--- spawn.c.orig	2022-05-17 11:54:19 UTC
++++ spawn.c
+@@ -456,7 +456,7 @@ spawn_pane(struct spawn_context *sc, char **cause)
+ complete:
+ #ifdef HAVE_UTEMPTER
+ 	if (~new_wp->flags & PANE_EMPTY) {
+-		xasprintf(&cp, "tmux(%lu).%%%u", (long)getpid(), new_wp->id);
++		xasprintf(&cp, ":tmux(%lu).%%%u", (long)getpid(), new_wp->id);
+ 		utempter_add_record(new_wp->fd, cp);
+ 		kill(getpid(), SIGCHLD);
+ 		free(cp);