diff --git a/plugins/api/discovery/src/org/apache/cloudstack/discovery/ApiDiscoveryServiceImpl.java b/plugins/api/discovery/src/org/apache/cloudstack/discovery/ApiDiscoveryServiceImpl.java
index 5ac2281b84e..bfd2719d8bd 100644
--- a/plugins/api/discovery/src/org/apache/cloudstack/discovery/ApiDiscoveryServiceImpl.java
+++ b/plugins/api/discovery/src/org/apache/cloudstack/discovery/ApiDiscoveryServiceImpl.java
@@ -107,7 +107,7 @@ public class ApiDiscoveryServiceImpl implements ApiDiscoveryService {
                 }
             }
 
-            Field[] fields = ReflectUtil.getAllFieldsForClass(cmdClass,
+            Set<Field> fields = ReflectUtil.getAllFieldsForClass(cmdClass,
                     new Class<?>[]{BaseCmd.class, BaseAsyncCmd.class, BaseAsyncCreateCmd.class});
 
             boolean isAsync = ReflectUtil.isCmdClassAsync(cmdClass,