diff --git a/modules/camera/Camera.h b/modules/camera/Camera.h
index 0ceaf25..072de35 100644
--- a/modules/camera/Camera.h
+++ b/modules/camera/Camera.h
@@ -34,7 +34,7 @@
     public:
         // id is used to distinguish cameras. 0 <= id < NUM_CAMERAS.
         // module is a handle to the HAL module, used when the device is opened.
-        Camera(int id);
+        explicit Camera(int id);
         virtual ~Camera();
 
         // Common Camera Device Operations (see <hardware/camera_common.h>)
diff --git a/modules/camera/CameraHAL.h b/modules/camera/CameraHAL.h
index 00c74e5..74a70a6 100644
--- a/modules/camera/CameraHAL.h
+++ b/modules/camera/CameraHAL.h
@@ -29,7 +29,7 @@
 // camera device.
 class CameraHAL {
     public:
-        CameraHAL(int num_cameras);
+        explicit CameraHAL(int num_cameras);
         ~CameraHAL();
 
         // Camera Module Interface (see <hardware/camera_common.h>)
diff --git a/modules/camera/ExampleCamera.h b/modules/camera/ExampleCamera.h
index 45c4a94..44eac76 100644
--- a/modules/camera/ExampleCamera.h
+++ b/modules/camera/ExampleCamera.h
@@ -27,7 +27,7 @@
 // metadata and logic about that device.
 class ExampleCamera : public Camera {
     public:
-        ExampleCamera(int id);
+        explicit ExampleCamera(int id);
         ~ExampleCamera();
 
     private:
diff --git a/modules/gralloc/gr.h b/modules/gralloc/gr.h
index 732b6bc..ac7e967 100644
--- a/modules/gralloc/gr.h
+++ b/modules/gralloc/gr.h
@@ -48,7 +48,7 @@
     class Autolock {
         Locker& locker;
     public:
-        inline Autolock(Locker& locker) : locker(locker) {  locker.lock(); }
+        inline explicit Autolock(Locker& locker) : locker(locker) {  locker.lock(); }
         inline ~Autolock() { locker.unlock(); }
     };
     inline Locker()        { pthread_mutex_init(&mutex, 0); }
diff --git a/modules/sensors/SensorEventQueue.h b/modules/sensors/SensorEventQueue.h
index 11e1f41..9778e93 100644
--- a/modules/sensors/SensorEventQueue.h
+++ b/modules/sensors/SensorEventQueue.h
@@ -38,7 +38,7 @@
     pthread_cond_t mSpaceAvailableCondition;
 
 public:
-    SensorEventQueue(int capacity);
+    explicit SensorEventQueue(int capacity);
     ~SensorEventQueue();
 
     // Returns length of region, between zero and min(capacity, requestedLength). If there is any
diff --git a/modules/usbcamera/Camera.h b/modules/usbcamera/Camera.h
index 6419c7d..4051345 100644
--- a/modules/usbcamera/Camera.h
+++ b/modules/usbcamera/Camera.h
@@ -38,7 +38,7 @@
     public:
         // id is used to distinguish cameras. 0 <= id < NUM_CAMERAS.
         // module is a handle to the HAL module, used when the device is opened.
-        Camera(int id);
+        explicit Camera(int id);
         virtual ~Camera();
 
         // Common Camera Device Operations (see <hardware/camera_common.h>)
diff --git a/modules/usbcamera/HotplugThread.h b/modules/usbcamera/HotplugThread.h
index a13adb7..625dcb4 100644
--- a/modules/usbcamera/HotplugThread.h
+++ b/modules/usbcamera/HotplugThread.h
@@ -36,7 +36,7 @@
 class HotplugThread : public android::Thread {
 
     public:
-        HotplugThread(CameraHAL *hal);
+        explicit HotplugThread(CameraHAL *hal);
         ~HotplugThread();
 
         // Override below two methods for proper cleanup.
diff --git a/modules/usbcamera/UsbCamera.h b/modules/usbcamera/UsbCamera.h
index fe52ade..57017fe 100644
--- a/modules/usbcamera/UsbCamera.h
+++ b/modules/usbcamera/UsbCamera.h
@@ -28,7 +28,7 @@
  */
 class UsbCamera : public Camera {
     public:
-        UsbCamera(int id);
+        explicit UsbCamera(int id);
         ~UsbCamera();
 
     private: