diff --git a/libavformat/h264dec.c b/libavformat/h264dec.c
index 3f5ed5eabb..cec8f85275 100644
--- a/libavformat/h264dec.c
+++ b/libavformat/h264dec.c
@@ -54,7 +54,7 @@ static int h264_probe(AVProbeData *p)
             case     1:   sli++; break;
             case     5:   idr++; break;
             case     7:
-                if(p->buf[i+2]&0x0F)
+                if(p->buf[i+2]&0x03)
                     return 0;
                 sps++;
                 break;