diff --git a/src/ranap_common_cn.c b/src/ranap_common_cn.c
index 5ed1a02..06123c1 100644
--- a/src/ranap_common_cn.c
+++ b/src/ranap_common_cn.c
@@ -63,6 +63,11 @@
 	case RANAP_ProcedureCode_id_RAB_ModifyRequest:
 		rc = ranap_decode_rab_modifyrequesties(&message->msg.raB_ModifyRequestIEs, &imsg->value);
 		break;
+	case RANAP_ProcedureCode_id_SecurityModeControl:
+		/* Only an RNC will receive a Security Mode Control as
+		 * Initiating Message, in other words: only hnb-test. */
+		rc = ranap_decode_securitymodecommandies(&message->msg.securityModeCommandIEs, &imsg->value);
+		break;
 	default:
 		LOGP(DRANAP, LOGL_NOTICE, "Received suspicious RANAP "
 		     "Procedure %s (CO, IM) from RNC, ignoring\n",
@@ -97,6 +102,11 @@
 	case RANAP_ProcedureCode_id_RAB_ModifyRequest:
 		ranap_free_rab_modifyrequesties(&message->msg.raB_ModifyRequestIEs);
 		break;
+	case RANAP_ProcedureCode_id_SecurityModeControl:
+		/* Only an RNC will receive a Security Mode Control as
+		 * Initiating Message, in other words: only hnb-test. */
+		ranap_free_securitymodecommandies(&message->msg.securityModeCommandIEs);
+		break;
 	default:
 		LOGP(DRANAP, LOGL_NOTICE, "Not freeing suspicious RANAP "
 		     "Procedure %s (CO, IM) from RNC\n",