diff --git a/plugins/hypervisors/ucs/src/org/apache/cloudstack/api/ListUcsManagerCmd.java b/plugins/hypervisors/ucs/src/org/apache/cloudstack/api/ListUcsManagerCmd.java
index 2f7b413ae23..7238e1ee40f 100755
--- a/plugins/hypervisors/ucs/src/org/apache/cloudstack/api/ListUcsManagerCmd.java
+++ b/plugins/hypervisors/ucs/src/org/apache/cloudstack/api/ListUcsManagerCmd.java
@@ -53,7 +53,7 @@ import com.cloud.user.Account;
 public class ListUcsManagerCmd extends BaseListCmd {
     public static final Logger s_logger = Logger.getLogger(ListUcsManagerCmd.class);
 
-    @Parameter(name=ApiConstants.ZONE_ID, type=CommandType.UUID, description="the zone id", entityType=ZoneResponse.class, required=true)
+    @Parameter(name=ApiConstants.ZONE_ID, type=CommandType.UUID, description="the zone id", entityType=ZoneResponse.class)
     private Long zoneId;
     
     @Parameter(name=ApiConstants.ID, type=CommandType.UUID, entityType=UcsManagerResponse.class,