diff --git a/lib/ui/compositing.dart b/lib/ui/compositing.dart
index f484f0e53c521c0d5a729d3747de1c0ea66b9713..d29e5f1a8e57dbc68a7ed25631e746ba883239b7 100644
--- a/lib/ui/compositing.dart
+++ b/lib/ui/compositing.dart
@@ -538,7 +538,7 @@ class SceneBuilder extends NativeFieldWrapperClass2 {
     return layer;
   }
 
-  EngineLayer _pushShaderMask(
+  void _pushShaderMask(
       EngineLayer engineLayer,
       Shader shader,
       double maskRectLeft,
@@ -587,7 +587,7 @@ class SceneBuilder extends NativeFieldWrapperClass2 {
     return layer;
   }
 
-  EngineLayer _pushPhysicalShape(EngineLayer outEngineLayer, Path path, double elevation, int color, int shadowColor,
+  void _pushPhysicalShape(EngineLayer outEngineLayer, Path path, double elevation, int color, int shadowColor,
       int clipBehavior) native 'SceneBuilder_pushPhysicalShape';
 
   /// Ends the effect of the most recently pushed operation.