diff --git a/include/binder/Parcel.h b/include/binder/Parcel.h
index 7a782f5..c95f297 100644
--- a/include/binder/Parcel.h
+++ b/include/binder/Parcel.h
@@ -101,6 +101,7 @@
     status_t            writeString16(const char16_t* str, size_t len);
     status_t            writeStrongBinder(const sp<IBinder>& val);
     status_t            writeWeakBinder(const wp<IBinder>& val);
+    status_t            writeInt32Array(size_t len, const int32_t *val);
 
     template<typename T>
     status_t            write(const Flattenable<T>& val);
diff --git a/include/powermanager/IPowerManager.h b/include/powermanager/IPowerManager.h
index 2f4c3c4..d85003f 100644
--- a/include/powermanager/IPowerManager.h
+++ b/include/powermanager/IPowerManager.h
@@ -35,6 +35,7 @@
     virtual status_t acquireWakeLockWithUid(int flags, const sp<IBinder>& lock, const String16& tag,
             const String16& packageName, int uid) = 0;
     virtual status_t releaseWakeLock(const sp<IBinder>& lock, int flags) = 0;
+    virtual status_t updateWakeLockUids(const sp<IBinder>& lock, int len, const int *uids) = 0;
 };
 
 // ----------------------------------------------------------------------------
diff --git a/libs/binder/Parcel.cpp b/libs/binder/Parcel.cpp
index 7a5919f..38e019c 100644
--- a/libs/binder/Parcel.cpp
+++ b/libs/binder/Parcel.cpp
@@ -617,6 +617,16 @@
 {
     return writeAligned(val);
 }
+status_t Parcel::writeInt32Array(size_t len, const int32_t *val) {
+    if (!val) {
+        return writeAligned(-1);
+    }
+    status_t ret = writeAligned(len);
+    if (ret == NO_ERROR) {
+        ret = write(val, len * sizeof(*val));
+    }
+    return ret;
+}
 
 status_t Parcel::writeInt64(int64_t val)
 {
diff --git a/services/powermanager/IPowerManager.cpp b/services/powermanager/IPowerManager.cpp
index 9f60e75..5ecd299 100644
--- a/services/powermanager/IPowerManager.cpp
+++ b/services/powermanager/IPowerManager.cpp
@@ -32,6 +32,7 @@
     ACQUIRE_WAKE_LOCK = IBinder::FIRST_CALL_TRANSACTION,
     ACQUIRE_WAKE_LOCK_UID = IBinder::FIRST_CALL_TRANSACTION + 1,
     RELEASE_WAKE_LOCK = IBinder::FIRST_CALL_TRANSACTION + 2,
+    UPDATE_WAKE_LOCK_UIDS = IBinder::FIRST_CALL_TRANSACTION + 3,
 };
 
 class BpPowerManager : public BpInterface<IPowerManager>
@@ -78,6 +79,16 @@
         data.writeInt32(flags);
         return remote()->transact(RELEASE_WAKE_LOCK, data, &reply);
     }
+
+    virtual status_t updateWakeLockUids(const sp<IBinder>& lock, int len, const int *uids) {
+        Parcel data, reply;
+        data.writeInterfaceToken(IPowerManager::getInterfaceDescriptor());
+        data.writeStrongBinder(lock);
+        data.writeInt32Array(len, uids);
+        // We don't really care too much if this succeeds (there's nothing we can do if it doesn't)
+        // but it should return ASAP
+        return remote()->transact(UPDATE_WAKE_LOCK_UIDS, data, &reply, IBinder::FLAG_ONEWAY);
+    }
 };
 
 IMPLEMENT_META_INTERFACE(PowerManager, "android.os.IPowerManager");