diff --git a/src/common/measure/mbt.ts b/src/common/measure/mbt.ts
index db8b000bd..5a5448cb2 100644
--- a/src/common/measure/mbt.ts
+++ b/src/common/measure/mbt.ts
@@ -23,7 +23,7 @@ const getMBT = (
 }
 
 const pad = (v: number, digit: number) => {
-  const str = v.toString(10)
+  const str = v.toFixed(0)
   return ("0".repeat(digit) + str).slice(-Math.max(digit, str.length))
 }
 
diff --git a/src/common/player/EventScheduler.test.ts b/src/common/player/EventScheduler.test.ts
index f5a68e13c..582a3b1aa 100644
--- a/src/common/player/EventScheduler.test.ts
+++ b/src/common/player/EventScheduler.test.ts
@@ -17,6 +17,7 @@ describe("EventScheduler", () => {
     {
       const result = s.readNextEvents(120, 0)
       expect(result.length).toBe(1)
+      expect(result[0].timestamp).toBe(0)
       expect(result[0].event).toBe(events[0])
     }
 
diff --git a/src/common/player/EventScheduler.ts b/src/common/player/EventScheduler.ts
index c8f88700a..d4ecd3df8 100644
--- a/src/common/player/EventScheduler.ts
+++ b/src/common/player/EventScheduler.ts
@@ -90,13 +90,11 @@ export default class EventScheduler<E extends SchedulableEvent> {
     }
     const delta = timestamp - this._prevTime
     const deltaTick = Math.max(0, this.millisecToTick(delta, bpm))
-    const nowTick = Math.floor(this._currentTick + deltaTick)
+    const nowTick = this._currentTick + deltaTick
 
     // 先読み時間
     // Leading time
-    const lookAheadTick = Math.floor(
-      this.millisecToTick(this.lookAheadTime, bpm),
-    )
+    const lookAheadTick = this.millisecToTick(this.lookAheadTime, bpm)
 
     // 前回スケジュール済みの時点から、
     // From the previous scheduled point,
diff --git a/src/main/components/PianoRoll/CanvasPianoRuler.tsx b/src/main/components/PianoRoll/CanvasPianoRuler.tsx
index 6c02b4de0..618ccc01d 100644
--- a/src/main/components/PianoRoll/CanvasPianoRuler.tsx
+++ b/src/main/components/PianoRoll/CanvasPianoRuler.tsx
@@ -49,7 +49,7 @@ function drawRuler(
       ctx.textBaseline = "top"
       ctx.font = `12px ${theme.canvasFont}`
       ctx.fillStyle = theme.secondaryTextColor
-      ctx.fillText(`${measure}`, x + textPadding, textPadding)
+      ctx.fillText(`${measure + 1}`, x + textPadding, textPadding)
     }
   })