diff --git a/policy/policy_contract.go b/policy/policy_contract.go
index 3a44153..b73b743 100644
--- a/policy/policy_contract.go
+++ b/policy/policy_contract.go
@@ -211,6 +211,7 @@ func ListChainsByPrefix(entity Kind, entityName string, prefix []byte) [][]byte
 
 func IteratorChainsByPrefix(entity Kind, entityName string, prefix []byte) iterator.Iterator {
 	ctx := storage.GetReadOnlyContext()
-	keyPrefix := storageKey(entity, entityName, prefix)
+	id, _ := mapToNumeric(ctx, []byte(entityName))
+	keyPrefix := storageKey(entity, id, prefix)
 	return storage.Find(ctx, keyPrefix, storage.ValuesOnly)
 }