diff --git a/media/jni/soundpool/SoundPool.h b/media/jni/soundpool/SoundPool.h
index 98d2fa25207c0..aff101f06748b 100644
--- a/media/jni/soundpool/SoundPool.h
+++ b/media/jni/soundpool/SoundPool.h
@@ -37,7 +37,7 @@ class SoundPool;
 // for queued events
 class SoundPoolEvent {
 public:
-    SoundPoolEvent(int msg, int arg1=0, int arg2=0) :
+    explicit SoundPoolEvent(int msg, int arg1=0, int arg2=0) :
         mMsg(msg), mArg1(arg1), mArg2(arg2) {}
     int         mMsg;
     int         mArg1;
diff --git a/media/jni/soundpool/SoundPoolThread.h b/media/jni/soundpool/SoundPoolThread.h
index 9096aeb3e30e1..7b3e1dda0a23b 100644
--- a/media/jni/soundpool/SoundPoolThread.h
+++ b/media/jni/soundpool/SoundPoolThread.h
@@ -40,7 +40,7 @@ public:
  */
 class SoundPoolThread {
 public:
-    SoundPoolThread(SoundPool* SoundPool);
+    explicit SoundPoolThread(SoundPool* SoundPool);
     ~SoundPoolThread();
     void loadSample(int sampleID);
     void quit();