diff --git a/libavformat/jacosubdec.c b/libavformat/jacosubdec.c
index 615191ee3f..67f4c37b92 100644
--- a/libavformat/jacosubdec.c
+++ b/libavformat/jacosubdec.c
@@ -67,7 +67,7 @@ static int jacosub_probe(AVProbeData *p)
             ptr++;
         if (*ptr != '#' && *ptr != '\n') {
             if (timed_line(ptr))
-                return AVPROBE_SCORE_MAX / 2;
+                return AVPROBE_SCORE_MAX/2 + 1;
             return 0;
         }
         ptr += strcspn(ptr, "\n") + 1;