diff --git a/src/bind/build/argus_dns_sync.sh b/src/bind/build/argus_dns_sync.sh
index 76c8f88..7cc8be4 100644
--- a/src/bind/build/argus_dns_sync.sh
+++ b/src/bind/build/argus_dns_sync.sh
@@ -61,7 +61,10 @@ upsert_record() {
     echo "[SKIP] ${name} unchanged (${new_ip})"
   fi
 
-  return $changed
+  if [[ $changed -eq 1 ]]; then
+    return 0
+  fi
+  return 1
 }
 
 while true; do
@@ -97,4 +100,3 @@ while true; do
 
   sleep "$SLEEP_SECONDS"
 done
-