diff --git a/media/ndk/NdkImageReaderPriv.h b/media/ndk/NdkImageReaderPriv.h
index e328cb1..19bd704 100644
--- a/media/ndk/NdkImageReaderPriv.h
+++ b/media/ndk/NdkImageReaderPriv.h
@@ -134,7 +134,7 @@
 
       private:
         AImageReader_ImageListener mListener = {nullptr, nullptr};
-        wp<AImageReader>           mReader;
+        const wp<AImageReader>     mReader;
         Mutex                      mLock;
     };
     sp<FrameListener> mFrameListener;
@@ -149,7 +149,7 @@
 
        private:
         AImageReader_BufferRemovedListener mListener = {nullptr, nullptr};
-        wp<AImageReader>           mReader;
+        const wp<AImageReader>     mReader;
         Mutex                      mLock;
     };
     sp<BufferRemovedListener> mBufferRemovedListener;