diff --git a/hooks/pg_dir_hooks.py b/hooks/pg_dir_hooks.py
index c298f38..81f9013 100755
--- a/hooks/pg_dir_hooks.py
+++ b/hooks/pg_dir_hooks.py
@@ -97,7 +97,9 @@ def plumgrid_configs_joined(relation_id=None):
         'plumgrid_username': config('plumgrid-username'),
         'plumgrid_password': config('plumgrid-password'),
     }
-    relation_set(relation_id=relation_id, relation_settings=relation_settings)
+    if is_leader():
+        relation_set(relation_id=relation_id,
+                     relation_settings=relation_settings)
 
 
 @hooks.hook('config-changed')