diff --git a/binder/android/os/IVoldListener.aidl b/binder/android/os/IVoldListener.aidl
index b3e4ba5..c4535b5 100644
--- a/binder/android/os/IVoldListener.aidl
+++ b/binder/android/os/IVoldListener.aidl
@@ -26,7 +26,7 @@
 
     void onVolumeCreated(@utf8InCpp String volId,
             int type, @utf8InCpp String diskId, @utf8InCpp String partGuid, int userId);
-    void onVolumeStateChanged(@utf8InCpp String volId, int state);
+    void onVolumeStateChanged(@utf8InCpp String volId, int state, int userId);
     void onVolumeMetadataChanged(@utf8InCpp String volId,
             @utf8InCpp String fsType, @utf8InCpp String fsUuid, @utf8InCpp String fsLabel);
     void onVolumePathChanged(@utf8InCpp String volId,
diff --git a/model/VolumeBase.cpp b/model/VolumeBase.cpp
index 27448da..e20a049 100644
--- a/model/VolumeBase.cpp
+++ b/model/VolumeBase.cpp
@@ -49,7 +49,8 @@
 
     auto listener = getListener();
     if (listener) {
-        listener->onVolumeStateChanged(getId(), static_cast<int32_t>(mState));
+        listener->onVolumeStateChanged(getId(), static_cast<int32_t>(mState),
+                                       static_cast<int32_t>(mMountUserId));
     }
 }