diff --git a/src/Sound.cpp b/src/Sound.cpp
index 2c3b5336..662891db 100644
--- a/src/Sound.cpp
+++ b/src/Sound.cpp
@@ -26,8 +26,6 @@ equivalents.
 #include "PixTone.h"
 #include "Tags.h"
 
-#define FREQUENCY 44100
-
 LPDIRECTSOUND       lpDS;            // DirectSoundオブジェクト (DirectSound object)
 LPDIRECTSOUNDBUFFER lpPRIMARYBUFFER; // 一時バッファ (Temporary buffer)
 LPDIRECTSOUNDBUFFER lpSECONDARYBUFFER[SE_MAX];