diff --git a/internal/input/input_js.go b/internal/input/input_js.go
index 986da047d..1b31f98fb 100644
--- a/internal/input/input_js.go
+++ b/internal/input/input_js.go
@@ -227,23 +227,23 @@ func OnKeyUp(e *js.Object) {
 	theInput.keyUp(code)
 }
 
-func OnMouseDown(e *js.Object, scale float64, left, top int) {
+func OnMouseDown(e *js.Object) {
 	e.Call("preventDefault")
 	button := e.Get("button").Int()
 	theInput.mouseDown(button)
-	setMouseCursorFromEvent(e, scale, left, top)
+	setMouseCursorFromEvent(e)
 }
 
-func OnMouseUp(e *js.Object, scale float64, left, top int) {
+func OnMouseUp(e *js.Object) {
 	e.Call("preventDefault")
 	button := e.Get("button").Int()
 	theInput.mouseUp(button)
-	setMouseCursorFromEvent(e, scale, left, top)
+	setMouseCursorFromEvent(e)
 }
 
-func OnMouseMove(e *js.Object, scale float64, left, top int) {
+func OnMouseMove(e *js.Object) {
 	e.Call("preventDefault")
-	setMouseCursorFromEvent(e, scale, left, top)
+	setMouseCursorFromEvent(e)
 }
 
 func OnTouchStart(e *js.Object, scale float64, left, top int) {
@@ -261,11 +261,9 @@ func OnTouchMove(e *js.Object, scale float64, left, top int) {
 	theInput.updateTouches(touchEventToTouches(e, scale, left, top))
 }
 
-func setMouseCursorFromEvent(e *js.Object, scale float64, left, top int) {
+func setMouseCursorFromEvent(e *js.Object) {
 	x, y := e.Get("clientX").Int(), e.Get("clientY").Int()
-	x -= left
-	y -= top
-	theInput.setMouseCursor(int(float64(x)/scale), int(float64(y)/scale))
+	theInput.setMouseCursor(x, y)
 }
 
 func touchEventToTouches(e *js.Object, scale float64, left, top int) []*Touch {
diff --git a/internal/ui/ui_js.go b/internal/ui/ui_js.go
index 80e0049a9..d5b70b7d7 100644
--- a/internal/ui/ui_js.go
+++ b/internal/ui/ui_js.go
@@ -78,7 +78,12 @@ func ScreenPadding() (x0, y0, x1, y1 float64) {
 }
 
 func AdjustedCursorPosition() (x, y int) {
-	return input.Get().CursorPosition()
+	x, y = input.Get().CursorPosition()
+	rect := canvas.Call("getBoundingClientRect")
+	x -= rect.Get("left").Int()
+	y -= rect.Get("top").Int()
+	scale := currentUI.getScale()
+	return int(float64(x) / scale), int(float64(y) / scale)
 }
 
 func IsCursorVisible() bool {
@@ -253,18 +258,9 @@ func initialize() error {
 	canvas.Call("addEventListener", "keyup", input.OnKeyUp)
 
 	// Mouse
-	canvas.Call("addEventListener", "mousedown", func(e *js.Object) {
-		rect := canvas.Call("getBoundingClientRect")
-		input.OnMouseDown(e, currentUI.getScale(), rect.Get("left").Int(), rect.Get("top").Int())
-	})
-	canvas.Call("addEventListener", "mouseup", func(e *js.Object) {
-		rect := canvas.Call("getBoundingClientRect")
-		input.OnMouseUp(e, currentUI.getScale(), rect.Get("left").Int(), rect.Get("top").Int())
-	})
-	canvas.Call("addEventListener", "mousemove", func(e *js.Object) {
-		rect := canvas.Call("getBoundingClientRect")
-		input.OnMouseMove(e, currentUI.getScale(), rect.Get("left").Int(), rect.Get("top").Int())
-	})
+	canvas.Call("addEventListener", "mousedown", input.OnMouseDown)
+	canvas.Call("addEventListener", "mouseup", input.OnMouseUp)
+	canvas.Call("addEventListener", "mousemove", input.OnMouseMove)
 	canvas.Call("addEventListener", "contextmenu", func(e *js.Object) {
 		e.Call("preventDefault")
 	})