diff --git a/media/libmediaplayerservice/nuplayer/GenericSource.h b/media/libmediaplayerservice/nuplayer/GenericSource.h
index 9fe49af..0957778 100644
--- a/media/libmediaplayerservice/nuplayer/GenericSource.h
+++ b/media/libmediaplayerservice/nuplayer/GenericSource.h
@@ -117,7 +117,7 @@
     // When necessary, it will send out buffering events to the player.
     struct BufferingMonitor : public AHandler {
     public:
-        BufferingMonitor(const sp<AMessage> &notify);
+        explicit BufferingMonitor(const sp<AMessage> &notify);
 
         // Set up state.
         void prepare(const sp<NuCachedSource2> &cachedSource,
diff --git a/media/ndk/NdkImageReaderPriv.h b/media/ndk/NdkImageReaderPriv.h
index 48f0953..8b540fa 100644
--- a/media/ndk/NdkImageReaderPriv.h
+++ b/media/ndk/NdkImageReaderPriv.h
@@ -112,7 +112,7 @@
 
     struct FrameListener : public ConsumerBase::FrameAvailableListener {
       public:
-        FrameListener(AImageReader* parent) : mReader(parent) {}
+        explicit FrameListener(AImageReader* parent) : mReader(parent) {}
 
         void onFrameAvailable(const BufferItem& item) override;