diff --git a/openbsc/src/nat/bsc_nat.c b/openbsc/src/nat/bsc_nat.c
index 90df41f..88fc3f8 100644
--- a/openbsc/src/nat/bsc_nat.c
+++ b/openbsc/src/nat/bsc_nat.c
@@ -743,7 +743,7 @@
 	}
 
 	on = 1;
-	rc = setsockopt(bfd->fd, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on));
+	rc = setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on));
 	if (rc != 0)
                 LOGP(DNAT, LOGL_ERROR, "Failed to set TCP_NODELAY: %s\n", strerror(errno));