diff --git a/openbsc/src/nat/bsc_nat_utils.c b/openbsc/src/nat/bsc_nat_utils.c
index 0cef01b..a3fd97a 100644
--- a/openbsc/src/nat/bsc_nat_utils.c
+++ b/openbsc/src/nat/bsc_nat_utils.c
@@ -721,3 +721,10 @@
 	return rc;
 }
 
+/**
+ * Rewrite non global numbers... according to rules based on the IMSI
+ */
+struct msgb *bsc_nat_rewrite_setup(struct bsc_nat *nat, struct msgb *msg, struct bsc_nat_parsed *pa)
+{
+	return msg;
+}