diff --git a/services/camera/libcameraservice/device3/Camera3BufferManager.h b/services/camera/libcameraservice/device3/Camera3BufferManager.h
index ab6541e..b5b86a3 100644
--- a/services/camera/libcameraservice/device3/Camera3BufferManager.h
+++ b/services/camera/libcameraservice/device3/Camera3BufferManager.h
@@ -44,7 +44,7 @@
  */
 class Camera3BufferManager: public virtual RefBase {
 public:
-    Camera3BufferManager(const sp<IGraphicBufferAlloc>& allocator = NULL);
+    explicit Camera3BufferManager(const sp<IGraphicBufferAlloc>& allocator = NULL);
 
     virtual ~Camera3BufferManager();
 
@@ -195,7 +195,7 @@
     struct GraphicBufferEntry {
         sp<GraphicBuffer> graphicBuffer;
         int fenceFd;
-        GraphicBufferEntry(const sp<GraphicBuffer>& gb = 0, int fd = -1) :
+        explicit GraphicBufferEntry(const sp<GraphicBuffer>& gb = 0, int fd = -1) :
             graphicBuffer(gb),
             fenceFd(fd) {}
     };
diff --git a/services/camera/libcameraservice/device3/Camera3OutputStream.h b/services/camera/libcameraservice/device3/Camera3OutputStream.h
index 7f7d6d2..46c1465 100644
--- a/services/camera/libcameraservice/device3/Camera3OutputStream.h
+++ b/services/camera/libcameraservice/device3/Camera3OutputStream.h
@@ -46,7 +46,7 @@
     uint32_t combinedUsage;
     size_t totalBufferCount;
     bool isConfigured;
-    StreamInfo(int id = CAMERA3_STREAM_ID_INVALID,
+    explicit StreamInfo(int id = CAMERA3_STREAM_ID_INVALID,
             int setId = CAMERA3_STREAM_SET_ID_INVALID,
             uint32_t w = 0,
             uint32_t h = 0,