diff --git a/bind-sidecar.py b/bind-sidecar.py
index 6c95b10..0831768 100755
--- a/bind-sidecar.py
+++ b/bind-sidecar.py
@@ -30,7 +30,8 @@ active_zones = set()
 
 
 def update_config():
-    master = socket.gethostbyname("bind-primary")
+    master = socket.gethostbyname("bind-primary") if args.replica else None
+
     with open(PATH_CONFIG + ".part", "w") as fh:
         for zone in active_zones:
             path = PATH_ZONEFILE % zone