diff --git a/terminal.c b/terminal.c
index 0418b688..9352e5df 100644
--- a/terminal.c
+++ b/terminal.c
@@ -2052,6 +2052,7 @@ term_enable_app_sync_updates(struct terminal *term)
     timerfd_settime(
         term->delayed_render_timer.upper_fd, 0,
         &(struct itimerspec){{0}}, NULL);
+    term->delayed_render_timer.is_armed = false;
 }
 
 void