diff --git a/media/mtp/IMtpDatabase.h b/media/mtp/IMtpDatabase.h
index 1245092..81fa60c 100644
--- a/media/mtp/IMtpDatabase.h
+++ b/media/mtp/IMtpDatabase.h
@@ -112,8 +112,8 @@
                                             MtpObjectHandle handle, bool succeeded) = 0;
 
     virtual MtpResponseCode         beginCopyObject(MtpObjectHandle handle, MtpObjectHandle newParent,
-                                            MtpStorageID newStorage);
-    virtual void                    endCopyObject(MtpObjectHandle handle, bool succeeded);
+                                            MtpStorageID newStorage) = 0;
+    virtual void                    endCopyObject(MtpObjectHandle handle, bool succeeded) = 0;
 };
 
 }; // namespace android