diff --git a/inpututil/inpututil.go b/inpututil/inpututil.go
index 0d03a42f9..752a1ef12 100644
--- a/inpututil/inpututil.go
+++ b/inpututil/inpututil.go
@@ -141,8 +141,8 @@ func (i *inputState) update() {
 			i.gamepadButtonDurations[id] = make([]int, ebiten.GamepadButtonMax+1)
 		}
 		n := ebiten.GamepadButtonNum(id)
-		if n > ebiten.GamepadButtonMax+1 {
-			n = ebiten.GamepadButtonMax + 1
+		if n > int(ebiten.GamepadButtonMax)+1 {
+			n = int(ebiten.GamepadButtonMax) + 1
 		}
 		for b := ebiten.GamepadButton(0); b < ebiten.GamepadButton(n); b++ {
 			if ebiten.IsGamepadButtonPressed(id, b) {