diff --git a/util/flv_sock.cpp b/util/flv_sock.cpp
index f9bd4b05..81a1cf74 100644
--- a/util/flv_sock.cpp
+++ b/util/flv_sock.cpp
@@ -96,9 +96,10 @@ bool FLV_GetPacket(FLV_Pack *& p, int sock){
       //calculate keyframeness, next time read header again, return true
       p->isKeyframe = false;
       if ((p->data[0] == 0x09) && (((p->data[11] & 0xf0) >> 4) == 1)){p->isKeyframe = true;}
-      int testlen = p->data[p->len-1] + 15;
+      int testlen = p->data[p->len-1] + 3;
       testlen += (p->data[p->len-2] << 8);
       testlen += (p->data[p->len-3] << 16);
+      testlen += (p->data[p->len-4] << 24);
       fprintf(stderr, "Len: %i, testlen: %i\n", p->len, testlen);
       done = true;
       sofar = 0;