diff --git a/openbsc/src/osmo-bsc_nat/bsc_ussd.c b/openbsc/src/osmo-bsc_nat/bsc_ussd.c
index e0c5c6d..f7753fb 100644
--- a/openbsc/src/osmo-bsc_nat/bsc_ussd.c
+++ b/openbsc/src/osmo-bsc_nat/bsc_ussd.c
@@ -128,6 +128,7 @@
 			if (ret < 0) {
 				LOGP(DNAT, LOGL_ERROR, "ignoring IPA response "
 					"message with malformed TLVs\n");
+				msgb_free(msg);
 				return ret;
 			}
 			if (TLVP_PRESENT(&tvp, IPAC_IDTAG_UNITNAME))