diff --git a/include/media/AudioSystem.h b/include/media/AudioSystem.h
index 89bc95d..d54ab35 100644
--- a/include/media/AudioSystem.h
+++ b/include/media/AudioSystem.h
@@ -218,8 +218,8 @@
         // IAudioFlingerClient
 
         // indicate a change in the configuration of an output or input: keeps the cached
-        // values for output/input parameters upto date in client process
-        virtual void ioConfigChanged(int event, audio_io_handle_t ioHandle, void *param2);
+        // values for output/input parameters up-to-date in client process
+        virtual void ioConfigChanged(int event, audio_io_handle_t ioHandle, const void *param2);
     };
 
     class AudioPolicyServiceClient: public IBinder::DeathRecipient
diff --git a/include/media/IAudioFlingerClient.h b/include/media/IAudioFlingerClient.h
index f3b4df1..75a9971 100644
--- a/include/media/IAudioFlingerClient.h
+++ b/include/media/IAudioFlingerClient.h
@@ -33,7 +33,7 @@
     DECLARE_META_INTERFACE(AudioFlingerClient);
 
     // Notifies a change of audio input/output configuration.
-    virtual void ioConfigChanged(int event, audio_io_handle_t ioHandle, void *param2) = 0;
+    virtual void ioConfigChanged(int event, audio_io_handle_t ioHandle, const void *param2) = 0;
 
 };