diff --git a/speechx/speechx/frontend/audio/audio_cache.h b/speechx/speechx/frontend/audio/audio_cache.h
index 17e1a838..6807412c 100644
--- a/speechx/speechx/frontend/audio/audio_cache.h
+++ b/speechx/speechx/frontend/audio/audio_cache.h
@@ -23,7 +23,7 @@ namespace ppspeech {
 // waves cache
 class AudioCache : public FrontendInterface {
   public:
-    explicit AudioCache(int buffer_size = kint16max);
+    explicit AudioCache(int buffer_size = 100*kint16max);
 
     virtual void Accept(const kaldi::VectorBase<BaseFloat>& waves);