diff --git a/openbsc/include/openbsc/bsc_nat.h b/openbsc/include/openbsc/bsc_nat.h
index 25b6429c4..0c9af9184 100644
--- a/openbsc/include/openbsc/bsc_nat.h
+++ b/openbsc/include/openbsc/bsc_nat.h
@@ -76,7 +76,7 @@ struct bsc_connection {
 	struct timer_list pong_timeout;
 
 	/* mgcp related code */
-	int endpoint_status[33];
+	int endpoint_status[32];
 	int last_endpoint;
 
 	/* a back pointer */