diff --git a/openbsc/src/nat/bsc_nat.c b/openbsc/src/nat/bsc_nat.c
index 997a57f..a380a61 100644
--- a/openbsc/src/nat/bsc_nat.c
+++ b/openbsc/src/nat/bsc_nat.c
@@ -422,7 +422,7 @@
 					struct rate_ctr_group *ctrg;
 					ctrg = con->bsc->cfg->stats.ctrg;
 					rate_ctr_inc(&ctrg->ctr[BCFG_CTR_SCCP_CALLS]);
-					if (bsc_mgcp_assign(con, msg) != 0)
+					if (bsc_mgcp_assign_patch(con, msg) != 0)
 						LOGP(DNAT, LOGL_ERROR, "Failed to assign...\n");
 				} else
 					LOGP(DNAT, LOGL_ERROR, "Assignment command but no BSC.\n");