diff --git a/packages/flutter/lib/src/cupertino/dialog.dart b/packages/flutter/lib/src/cupertino/dialog.dart
index b99d7d96e2..0a7286bb70 100644
--- a/packages/flutter/lib/src/cupertino/dialog.dart
+++ b/packages/flutter/lib/src/cupertino/dialog.dart
@@ -808,7 +808,8 @@ class _CupertinoDialogRenderWidget extends RenderObjectWidget {
   void updateRenderObject(BuildContext context, _RenderCupertinoDialog renderObject) {
     renderObject
       ..isInAccessibilityMode = _isInAccessibilityMode(context) && !isActionSheet
-      ..dividerColor = CupertinoDynamicColor.resolve(dividerColor, context);
+      ..dividerColor = CupertinoDynamicColor.resolve(dividerColor, context)
+      ..isActionSheet = isActionSheet;
   }
 
   @override