1 files changed, 6 insertions, 2 deletions
diff --git a/tty.c b/tty.c
index 82436959..92827f5d 100644
--- a/tty.c
+++ b/tty.c
@@ -1438,15 +1438,19 @@ tty_draw_line(struct tty *tty, struct window_pane *wp, struct screen *s,
 void
 tty_sync_start(struct tty *tty)
 {
-	if (tty_get_flags(tty) & TERM_SYNC)
+	if ((~tty->flags & TTY_SYNCING) && (tty_get_flags(tty) & TERM_SYNC)) {
 		tty_puts(tty, "\033P=1s\033\\");
+		tty->flags |= TTY_SYNCING;
+	}
 }
 
 void
 tty_sync_end(struct tty *tty)
 {
-	if (tty_get_flags(tty) & TERM_SYNC)
+	if (tty_get_flags(tty) & TERM_SYNC) {
 		tty_puts(tty, "\033P=2s\033\\");
+		tty->flags &= ~TTY_SYNCING;
+	}
 }
 
 static int