diff --git a/src/sj/Game.d b/src/sj/Game.d
index 4dc77f9..ac4fa60 100644
--- a/src/sj/Game.d
+++ b/src/sj/Game.d
@@ -51,7 +51,8 @@ class Game : AbstractGame {
 
     if (args.debug_music_index >= 0) {
       enforce(args.debug_music_index < music_list.length);
-      load_.Initialize(music_list_[args.debug_music_index]);
+      load_.Initialize(
+          music_list_[args.debug_music_index], args.debug_music_offset_beat);
       super(load_);
 
     } else {
diff --git a/src/sj/LoadingScene.d b/src/sj/LoadingScene.d
index 5f4abc0..bfc5789 100644
--- a/src/sj/LoadingScene.d
+++ b/src/sj/LoadingScene.d
@@ -35,7 +35,7 @@ class LoadingScene : SceneInterface {
   }
 
   ///
-  void Initialize(Music music, float offset_beat = 0) {
+  void Initialize(Music music, float offset_beat) {
     music_       = music;
     offset_beat_ = offset_beat;
 
diff --git a/src/sj/Music.d b/src/sj/Music.d
index f763c12..902a855 100644
--- a/src/sj/Music.d
+++ b/src/sj/Music.d
@@ -66,7 +66,7 @@ class Music {
   ///
   void PlayForGame(float offset_beat) {
     sfMusic_setPlayingOffset(music_,
-        sfMilliseconds((offset_beat*bpm_ / 60f / 1e-6f).to!int));
+        sfMilliseconds((offset_beat / bpm_ * 60f * 1000f).to!int));
     sfMusic_play(music_);
   }
   ///
diff --git a/src/sj/PlayScene.d b/src/sj/PlayScene.d
index 150d18f..3049aa6 100644
--- a/src/sj/PlayScene.d
+++ b/src/sj/PlayScene.d
@@ -35,7 +35,7 @@ class PlayScene : SceneInterface {
   }
 
   ///
-  void Initialize(Music music, sjplayer.Context context, float offset_beat = 0) {
+  void Initialize(Music music, sjplayer.Context context, float offset_beat) {
     music_   = music;
     context_ = context;
 
diff --git a/src/sj/SelectScene.d b/src/sj/SelectScene.d
index 8a789ed..9ad3ffc 100644
--- a/src/sj/SelectScene.d
+++ b/src/sj/SelectScene.d
@@ -389,7 +389,7 @@ private class MusicPlayState : AbstractSceneState {
     if (anime_.isFinished) {
       music_.StopPlaying();
 
-      owner.load_scene_.Initialize(music_);
+      owner.load_scene_.Initialize(music_, 0);
       return CreateResult(owner.load_scene_);
     }
     return CreateResult(this);