diff --git a/cocos/audio/apple/AudioDecoderEXT.h b/cocos/audio/apple/AudioDecoderEXT.h
index 7df38a0898..2037b8cd0d 100644
--- a/cocos/audio/apple/AudioDecoderEXT.h
+++ b/cocos/audio/apple/AudioDecoderEXT.h
@@ -30,7 +30,7 @@
 #import <AudioToolbox/ExtendedAudioFile.h>
 #include "audio/include/AudioDecoder.h"
 
-namespace cocos2d { namespace experimental{
+namespace cocos2d {
 
 /**
  * @brief The class for decoding compressed audio file to PCM buffer.
@@ -94,4 +94,4 @@ private:
     AudioStreamBasicDescription _outputFormat;
 };
 
-}} // namespace cocos2d { namespace experimental{
+} // namespace cocos2d {