diff --git a/input.c b/input.c
index fa9dfcdf..05654124 100644
--- a/input.c
+++ b/input.c
@@ -2292,6 +2292,8 @@ input_exit_osc(struct input_ctx *ictx)
 	option = 0;
 	while (*p >= '0' && *p <= '9')
 		option = option * 10 + *p++ - '0';
+	if (*p != ';' && *p != '\0')
+		return;
 	if (*p == ';')
 		p++;