diff --git a/media/ndk/NdkMediaDataSourcePriv.h b/media/ndk/NdkMediaDataSourcePriv.h
index a1cb331..7bb3a26 100644
--- a/media/ndk/NdkMediaDataSourcePriv.h
+++ b/media/ndk/NdkMediaDataSourcePriv.h
@@ -48,6 +48,9 @@
     virtual String8 toString();
     virtual String8 getMIMEType() const;
 
+protected:
+    virtual ~NdkDataSource();
+
 private:
 
     Mutex mLock;