diff --git a/gst/mpegtsdemux/mpegtspacketizer.c b/gst/mpegtsdemux/mpegtspacketizer.c
index 6f21bb5a5e..a64fd005c6 100644
--- a/gst/mpegtsdemux/mpegtspacketizer.c
+++ b/gst/mpegtsdemux/mpegtspacketizer.c
@@ -800,7 +800,7 @@ mpegts_packetizer_next_packet (MpegTSPacketizer2 * packetizer,
     GST_LOG ("Lost sync %d", packet_size);
 
     /* Find the 0x47 in the buffer (and require at least 2 checks) */
-    for (; sync_offset < priv->mapped_size + 2 * packet_size; sync_offset++)
+    for (; sync_offset + 2 * packet_size < priv->mapped_size; sync_offset++)
       if (priv->mapped[sync_offset] == 0x47 &&
           priv->mapped[sync_offset + packet_size] == 0x47 &&
           priv->mapped[sync_offset + 2 * packet_size] == 0x47)