diff --git a/libavformat/ncdec.c b/libavformat/ncdec.c
index 056381b1c2..8e51f840d2 100644
--- a/libavformat/ncdec.c
+++ b/libavformat/ncdec.c
@@ -35,7 +35,7 @@ static int nc_probe(AVProbeData *probe_packet)
     size = AV_RL16(probe_packet->buf + 5);
 
     if (size + 20 > probe_packet->buf_size)
-        return 3*AVPROBE_SCORE_MAX/2;
+        return AVPROBE_SCORE_MAX/4;
 
     if (AV_RB32(probe_packet->buf+16+size) == NC_VIDEO_FLAG)
         return AVPROBE_SCORE_MAX;