diff --git a/audio/audio.go b/audio/audio.go
index dd000b3d1..223424bb2 100644
--- a/audio/audio.go
+++ b/audio/audio.go
@@ -190,8 +190,8 @@ type Context struct {
 	players      *players
 	driver       *driver.Player
 	sampleRate   int
-	frames       int
-	writtenBytes int
+	frames       int64
+	writtenBytes int64
 }
 
 var (
@@ -247,7 +247,7 @@ func (c *Context) Update() error {
 	}
 	c.frames++
 	bytesPerFrame := c.sampleRate * bytesPerSample * channelNum / ebiten.FPS
-	l := (c.frames * bytesPerFrame) - c.writtenBytes
+	l := (c.frames * int64(bytesPerFrame)) - c.writtenBytes
 	l &= mask
 	c.writtenBytes += l
 	buf := make([]byte, l)
diff --git a/internal/loop/run.go b/internal/loop/run.go
index d81cc4df5..ad01bb4ed 100644
--- a/internal/loop/run.go
+++ b/internal/loop/run.go
@@ -32,7 +32,7 @@ type runContext struct {
 	fps            int
 	currentFPS     float64
 	runningSlowly  bool
-	frames         int
+	frames         int64
 	lastUpdated    int64
 	lastFPSUpdated int64
 	m              sync.RWMutex