diff --git a/ncm-metaconfig/src/main/metaconfig/zookeeper/pan/schema.pan b/ncm-metaconfig/src/main/metaconfig/zookeeper/pan/schema.pan
index 415cbe24bf..56bb075331 100644
--- a/ncm-metaconfig/src/main/metaconfig/zookeeper/pan/schema.pan
+++ b/ncm-metaconfig/src/main/metaconfig/zookeeper/pan/schema.pan
@@ -2,6 +2,10 @@ declaration template metaconfig/zookeeper/schema;
 
 include 'pan/types';
 
+type zookeeper_four_letter_word = choice(
+    'conf', 'cons', 'crst', 'dump', 'envi', 'mntr', 'ruok', 'srst', 'srvr', 'stat', 'wchc', 'wchp', 'wchs'
+);
+
 type zookeeper_main = {
     # minimal
     "tickTime" : long = 2000
@@ -22,8 +26,7 @@ type zookeeper_main = {
     "autopurge.snapRetainCount" ? long
     "autopurge.purgeInterval" ? long
     "syncEnabled" ? boolean
-    "4lw.commands.whitelist" ? choice('conf', 'cons', 'crst', 'dump', 'envi', 'mntr',
-        'ruok', 'srst', 'srvr', 'stat', 'wchc', 'wchp', 'wchs') []
+    "4lw.commands.whitelist" ? zookeeper_four_letter_word[]
 
     # cluster/ensemble
     "initLimit" : long = 10