diff --git a/openair3/NAS/NR_UE/nr_nas_msg_sim.c b/openair3/NAS/NR_UE/nr_nas_msg_sim.c
index d73e95b030..c487887e7b 100644
--- a/openair3/NAS/NR_UE/nr_nas_msg_sim.c
+++ b/openair3/NAS/NR_UE/nr_nas_msg_sim.c
@@ -741,7 +741,7 @@ static void generateDeregistrationRequest(nr_ue_nas_t *nas, as_nas_info_t *initi
   sp_msg->header.protocol_discriminator = FGS_MOBILITY_MANAGEMENT_MESSAGE;
   sp_msg->header.security_header_type = INTEGRITY_PROTECTED_AND_CIPHERED;
   sp_msg->header.message_authentication_code = 0;
-  sp_msg->header.sequence_number = 2;
+  sp_msg->header.sequence_number = 3;
   int size = sizeof(fgs_nas_message_security_header_t);
 
   fgs_deregistration_request_ue_originating_msg *dereg_req = &sp_msg->plain.mm_msg.fgs_deregistration_request_ue_originating;
@@ -805,7 +805,9 @@ static void generatePduSessionEstablishRequest(nr_ue_nas_t *nas, as_nas_info_t *
   nas_stream_cipher_t stream_cipher;
   uint8_t             mac[4];
   nas_msg.header.protocol_discriminator = FGS_MOBILITY_MANAGEMENT_MESSAGE;
-  nas_msg.header.security_header_type = INTEGRITY_PROTECTED_AND_CIPHERED_WITH_NEW_SECU_CTX;
+  nas_msg.header.security_header_type = INTEGRITY_PROTECTED_AND_CIPHERED;
+  nas_msg.header.sequence_number = 2;
+
   size += 7;
 
   mm_msg = &nas_msg.security_protected.plain.mm_msg;
@@ -858,7 +860,7 @@ static void generatePduSessionEstablishRequest(nr_ue_nas_t *nas, as_nas_info_t *
 
   stream_cipher.key        = nas->security.knas_int;
   stream_cipher.key_length = 16;
-  stream_cipher.count      = nas->security.sm_counter++;
+  stream_cipher.count      = nas->security.mm_counter++;
   stream_cipher.bearer     = 1;
   stream_cipher.direction  = 0;
   stream_cipher.message    = (unsigned char *)(initialNasMsg->data + 6);