diff --git a/openbsc/include/openbsc/bsc_nat.h b/openbsc/include/openbsc/bsc_nat.h
index 64c6b86..040d393 100644
--- a/openbsc/include/openbsc/bsc_nat.h
+++ b/openbsc/include/openbsc/bsc_nat.h
@@ -248,7 +248,7 @@
 int update_sccp_src_ref(struct sccp_connections *sccp, struct bsc_nat_parsed *parsed);
 void remove_sccp_src_ref(struct bsc_connection *bsc, struct msgb *msg, struct bsc_nat_parsed *parsed);
 struct sccp_connections *patch_sccp_src_ref_to_bsc(struct msgb *, struct bsc_nat_parsed *, struct bsc_nat *);
-struct sccp_connections *patch_sccp_src_ref_to_msc(struct msgb *, struct bsc_nat_parsed *, struct bsc_nat *);
+struct sccp_connections *patch_sccp_src_ref_to_msc(struct msgb *, struct bsc_nat_parsed *, struct bsc_connection *);
 
 /**
  * MGCP/Audio handling
diff --git a/openbsc/src/nat/bsc_nat.c b/openbsc/src/nat/bsc_nat.c
index 00dcc88..eaa9d30 100644
--- a/openbsc/src/nat/bsc_nat.c
+++ b/openbsc/src/nat/bsc_nat.c
@@ -524,17 +524,17 @@
 		case SCCP_MSG_TYPE_CR:
 			if (create_sccp_src_ref(bsc, msg, parsed) != 0)
 				goto exit2;
-			con = patch_sccp_src_ref_to_msc(msg, parsed, nat);
+			con = patch_sccp_src_ref_to_msc(msg, parsed, bsc);
 			break;
 		case SCCP_MSG_TYPE_RLSD:
 		case SCCP_MSG_TYPE_CREF:
 		case SCCP_MSG_TYPE_DT1:
 		case SCCP_MSG_TYPE_CC:
 		case SCCP_MSG_TYPE_IT:
-			con = patch_sccp_src_ref_to_msc(msg, parsed, nat);
+			con = patch_sccp_src_ref_to_msc(msg, parsed, bsc);
 			break;
 		case SCCP_MSG_TYPE_RLC:
-			con = patch_sccp_src_ref_to_msc(msg, parsed, nat);
+			con = patch_sccp_src_ref_to_msc(msg, parsed, bsc);
 			remove_sccp_src_ref(bsc, msg, parsed);
 			break;
 		case SCCP_MSG_TYPE_UDT:
diff --git a/openbsc/src/nat/bsc_sccp.c b/openbsc/src/nat/bsc_sccp.c
index e84ffe9..58302cc 100644
--- a/openbsc/src/nat/bsc_sccp.c
+++ b/openbsc/src/nat/bsc_sccp.c
@@ -204,11 +204,14 @@
  */
 struct sccp_connections *patch_sccp_src_ref_to_msc(struct msgb *msg,
 						   struct bsc_nat_parsed *parsed,
-						   struct bsc_nat *nat)
+						   struct bsc_connection *bsc)
 {
 	struct sccp_connections *conn;
 
-	llist_for_each_entry(conn, &nat->sccp_connections, list_entry) {
+	llist_for_each_entry(conn, &bsc->nat->sccp_connections, list_entry) {
+		if (conn->bsc != bsc)
+			continue;
+
 		if (parsed->src_local_ref) {
 			if (equal(parsed->src_local_ref, &conn->real_ref)) {
 				*parsed->src_local_ref = conn->patched_ref;
diff --git a/openbsc/tests/bsc-nat/bsc_nat_test.c b/openbsc/tests/bsc-nat/bsc_nat_test.c
index 7ff2c20..e046e77 100644
--- a/openbsc/tests/bsc-nat/bsc_nat_test.c
+++ b/openbsc/tests/bsc-nat/bsc_nat_test.c
@@ -267,7 +267,7 @@
 	/* 1.) create a connection */
 	copy_to_msg(msg, bsc_cr, sizeof(bsc_cr));
 	parsed = bsc_nat_parse(msg);
-	con_found = patch_sccp_src_ref_to_msc(msg, parsed, nat);
+	con_found = patch_sccp_src_ref_to_msc(msg, parsed, con);
 	if (con_found != NULL) {
 		fprintf(stderr, "Con should not exist %p\n", con_found);
 		abort();
@@ -277,7 +277,7 @@
 		fprintf(stderr, "Failed to create a ref\n");
 		abort();
 	}
-	con_found = patch_sccp_src_ref_to_msc(msg, parsed, nat);
+	con_found = patch_sccp_src_ref_to_msc(msg, parsed, con);
 	if (!con_found || con_found->bsc != con) {
 		fprintf(stderr, "Failed to find the con: %p\n", con_found);
 		abort();
@@ -301,7 +301,7 @@
 	/* 3.) send some data */
 	copy_to_msg(msg, bsc_dtap, sizeof(bsc_dtap));
 	parsed = bsc_nat_parse(msg);
-	con_found = patch_sccp_src_ref_to_msc(msg, parsed, nat);
+	con_found = patch_sccp_src_ref_to_msc(msg, parsed, con);
 	VERIFY(con_found, con, msg, bsc_dtap_patched, "BSC DTAP");
 
 	/* 4.) receive some data */
@@ -319,7 +319,7 @@
 	/* 6.) confirm the connection close */
 	copy_to_msg(msg, bsc_rlc, sizeof(bsc_rlc));
 	parsed = bsc_nat_parse(msg);
-	con_found = patch_sccp_src_ref_to_msc(msg, parsed, nat);
+	con_found = patch_sccp_src_ref_to_msc(msg, parsed, con);
 	if (!con_found || con_found->bsc != con) {
 		fprintf(stderr, "Failed to find the con: %p\n", con_found);
 		abort();
@@ -333,7 +333,7 @@
 
 	copy_to_msg(msg, bsc_rlc, sizeof(bsc_rlc));
 	parsed = bsc_nat_parse(msg);
-	con_found = patch_sccp_src_ref_to_msc(msg, parsed, nat);
+	con_found = patch_sccp_src_ref_to_msc(msg, parsed, con);
 
 	/* verify that it is gone */
 	if (con_found != NULL) {