diff --git a/inputcontrol/controller_windows.go b/inputcontrol/controller_windows.go
index ad0b283..58b5e9a 100644
--- a/inputcontrol/controller_windows.go
+++ b/inputcontrol/controller_windows.go
@@ -111,9 +111,11 @@ func (p *windowsController) sendInput(inputs []keybdInput) error {
 	if len(inputs) == 0 {
 		return nil
 	}
-	_, _, err := sendInputProc.Call(uintptr(len(inputs)),
-		uintptr(unsafe.Pointer(&inputs[0])), unsafe.Sizeof(inputs[0]))
-	return err
+	if sent, _, err := sendInputProc.Call(uintptr(len(inputs)),
+		uintptr(unsafe.Pointer(&inputs[0])), unsafe.Sizeof(inputs[0])); int(sent) != len(inputs) {
+		return err
+	}
+	return nil
 }
 
 func (p *windowsController) KeyboardText(text string) error {
@@ -194,8 +196,11 @@ func (p *windowsController) PointerButton(button PointerButton, press bool) erro
 	} else {
 		return fmt.Errorf("unsupported pointer button: %#v", button)
 	}
-	_, _, err := sendInputProc.Call(1, uintptr(unsafe.Pointer(&input)), unsafe.Sizeof(input))
-	return err
+	if sent, _, err := sendInputProc.Call(1, uintptr(unsafe.Pointer(&input)),
+		unsafe.Sizeof(input)); int(sent) != 1 {
+		return err
+	}
+	return nil
 }
 
 func (p *windowsController) PointerMove(deltaX, deltaY int) error {
@@ -205,8 +210,11 @@ func (p *windowsController) PointerMove(deltaX, deltaY int) error {
 		dy:      int32(deltaY),
 		dwFlags: mouseeventfMove,
 	}
-	_, _, err := sendInputProc.Call(1, uintptr(unsafe.Pointer(&input)), unsafe.Sizeof(input))
-	return err
+	if sent, _, err := sendInputProc.Call(1, uintptr(unsafe.Pointer(&input)),
+		unsafe.Sizeof(input)); int(sent) != 1 {
+		return err
+	}
+	return nil
 }
 
 func (p *windowsController) PointerScroll(deltaHorizontal, deltaVertical int, finish bool) error {
@@ -228,7 +236,9 @@ func (p *windowsController) PointerScroll(deltaHorizontal, deltaVertical int, fi
 	if len(inputs) == 0 {
 		return nil
 	}
-	_, _, err := sendInputProc.Call(uintptr(len(inputs)),
-		uintptr(unsafe.Pointer(&inputs[0])), unsafe.Sizeof(inputs[0]))
-	return err
+	if sent, _, err := sendInputProc.Call(uintptr(len(inputs)),
+		uintptr(unsafe.Pointer(&inputs[0])), unsafe.Sizeof(inputs[0])); int(sent) != len(inputs) {
+		return err
+	}
+	return nil
 }