diff --git a/src/lte/model/lte-rrc-header.cc b/src/lte/model/lte-rrc-header.cc
index c8ab7b3c8..8baa7bd7a 100644
--- a/src/lte/model/lte-rrc-header.cc
+++ b/src/lte/model/lte-rrc-header.cc
@@ -1561,7 +1561,7 @@ LteRrcSap::RrcConnectionRequest
 RrcConnectionRequestHeader::GetMessage () const
 {
   RrcConnectionRequest msg;
-  msg.ueIdentity = (m_mmec.to_ulong () << 32) | (m_mTmsi.to_ulong ());
+  msg.ueIdentity = (((uint64_t) m_mmec.to_ulong ()) << 32) | (m_mTmsi.to_ulong ());
 
   return msg;
 }