diff --git a/lib/slider_thumb.dart b/lib/slider_thumb.dart
index 0d926c8..b93c120 100644
--- a/lib/slider_thumb.dart
+++ b/lib/slider_thumb.dart
@@ -47,6 +47,8 @@ class RetroSliderThumbShape extends SliderComponentShape {
     SliderThemeData sliderTheme,
     TextDirection textDirection,
     double value,
+    double textScaleFactor,
+    Size sizeWithOverflow,
   }) {
     final Canvas canvas = context.canvas;
     // RetroSliderTrackShape sometrack = RetroSliderTrackShape();