diff --git a/openair3/ocp-gtpu/gtp_itf.cpp b/openair3/ocp-gtpu/gtp_itf.cpp
index 2862a4d906..b371c5c0d6 100644
--- a/openair3/ocp-gtpu/gtp_itf.cpp
+++ b/openair3/ocp-gtpu/gtp_itf.cpp
@@ -703,7 +703,7 @@ static int Gtpv1uHandleGpdu(int h,
   int offset=8;
 
   if( msgHdr->E ||  msgHdr->S ||msgHdr->PN)
-    offset+=4;
+    offset+=8;
 
   // This context is not good for gtp
   // frame, ... has no meaning