diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index 3288490590f2..0c85c8a9e752 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -1366,7 +1366,7 @@ bool __skb_flow_dissect(const struct net *net,
 			break;
 		}
 
-		nhoff += ntohs(hdr->message_length);
+		nhoff += sizeof(struct ptp_header);
 		fdret = FLOW_DISSECT_RET_OUT_GOOD;
 		break;
 	}