diff --git a/openbsc/src/osmo-bsc_nat/bsc_nat.c b/openbsc/src/osmo-bsc_nat/bsc_nat.c
index 4a6e36d..2950745 100644
--- a/openbsc/src/osmo-bsc_nat/bsc_nat.c
+++ b/openbsc/src/osmo-bsc_nat/bsc_nat.c
@@ -608,6 +608,11 @@
 			goto send_to_all;
 			break;
 		case SCCP_MSG_TYPE_RLSD:
+			if (con && con->con_local == NAT_CON_END_USSD) {
+				LOGP(DNAT, LOGL_NOTICE, "RLSD for a USSD connection. Ignoring.\n");
+				con = NULL;
+			}
+			/* fall through */
 		case SCCP_MSG_TYPE_CREF:
 		case SCCP_MSG_TYPE_DT1:
 		case SCCP_MSG_TYPE_IT:
@@ -623,6 +628,10 @@
 						LOGP(DNAT, LOGL_ERROR, "Failed to assign...\n");
 				} else
 					LOGP(DNAT, LOGL_ERROR, "Assignment command but no BSC.\n");
+			} else if (con && con->con_local == NAT_CON_END_USSD &&
+				   parsed->gsm_type == BSS_MAP_MSG_CLEAR_CMD) {
+				LOGP(DNAT, LOGL_NOTICE, "Clear Command for USSD Connection. Ignoring.\n");
+				con = NULL;
 			}
 			break;
 		case SCCP_MSG_TYPE_CC: