diff --git a/manifests/server/instance/config.pp b/manifests/server/instance/config.pp
index e05c55e14d..6a2aa8e49d 100644
--- a/manifests/server/instance/config.pp
+++ b/manifests/server/instance/config.pp
@@ -211,7 +211,8 @@
     }
   }
   if $logdir {
-    postgresql::server::config_entry { "log_directory for instance ${name}":
+    postgresql::server::config_entry { "log_directory_for_instance_${name}":
+      key   => 'log_directory',
       value => $logdir,
     }
   }