diff --git a/openbsc/src/nat/bsc_nat.c b/openbsc/src/nat/bsc_nat.c
index dcacfb9..0a58515 100644
--- a/openbsc/src/nat/bsc_nat.c
+++ b/openbsc/src/nat/bsc_nat.c
@@ -864,7 +864,7 @@
 					 * replace the msg and the parsed structure becomes
 					 * invalid.
 					 */
-					msg = bsc_nat_rewrite_setup(bsc->nat, msg, parsed);
+					msg = bsc_nat_rewrite_setup(bsc->nat, msg, parsed, con->imsi);
 					talloc_free(parsed);
 					parsed = NULL;
 				}