diff --git a/panache_ui/lib/src/screens/editor/controls/color_picker/color_slider.dart b/panache_ui/lib/src/screens/editor/controls/color_picker/color_slider.dart
index 63eb516..5cc3abe 100644
--- a/panache_ui/lib/src/screens/editor/controls/color_picker/color_slider.dart
+++ b/panache_ui/lib/src/screens/editor/controls/color_picker/color_slider.dart
@@ -1097,7 +1097,7 @@ class _RenderSlider extends RenderBox {
   }
 }
 
-class GradientSliderThemeData extends Diagnosticable {
+class GradientSliderThemeData with Diagnosticable {
   const GradientSliderThemeData({
     @required this.startRailColor,
     @required this.endRailColor,