diff --git a/services/powermanager/IPowerManager.cpp b/services/powermanager/IPowerManager.cpp
index 0c43e909e..ee730d6ec 100644
--- a/services/powermanager/IPowerManager.cpp
+++ b/services/powermanager/IPowerManager.cpp
@@ -55,6 +55,7 @@ public:
         data.writeString16(tag);
         data.writeString16(packageName);
         data.writeInt32(0); // no WorkSource
+        data.writeString16(NULL, 0); // no history tag
         return remote()->transact(ACQUIRE_WAKE_LOCK, data, &reply);
     }