diff --git a/plugin/kvm/src/main/java/org/zstack/kvm/KVMAgentCommands.java b/plugin/kvm/src/main/java/org/zstack/kvm/KVMAgentCommands.java
index 82014cb2ee3..64a4a6cbc0f 100755
--- a/plugin/kvm/src/main/java/org/zstack/kvm/KVMAgentCommands.java
+++ b/plugin/kvm/src/main/java/org/zstack/kvm/KVMAgentCommands.java
@@ -5232,7 +5232,7 @@ public static class GCPoolCmd extends AgentCommand {
         public String poolUuid;
         public String mountPoint;
         public boolean force;
-        public List<VolumeTO> volumes;
+        public List<String> inUseCacheUuids;
     }
 
     public static class AllocateCacheCmd extends AgentCommand {