diff --git a/lib/src/asn1/liblte_mme.cc b/lib/src/asn1/liblte_mme.cc
index 305fdb86b..68fdc805f 100644
--- a/lib/src/asn1/liblte_mme.cc
+++ b/lib/src/asn1/liblte_mme.cc
@@ -320,7 +320,7 @@ LIBLTE_ERROR_ENUM liblte_mme_pack_mobile_id_ie(LIBLTE_MME_MOBILE_ID_STRUCT  *mob
             odd = false;
         }else if(LIBLTE_MME_MOBILE_ID_TYPE_TMSI == mobile_id->type_of_id){
             id32 = mobile_id->tmsi;
-            length = 4;
+            length = 5;
             odd = false;
         }
         }else{