diff --git a/packages/flutter/lib/src/cupertino/switch.dart b/packages/flutter/lib/src/cupertino/switch.dart
index 550c9531b48..1433289d4d3 100644
--- a/packages/flutter/lib/src/cupertino/switch.dart
+++ b/packages/flutter/lib/src/cupertino/switch.dart
@@ -378,6 +378,7 @@ class _CupertinoSwitchRenderObjectWidget extends LeafRenderObjectWidget {
 
   @override
   void updateRenderObject(BuildContext context, _RenderCupertinoSwitch renderObject) {
+    assert(renderObject._state == state);
     renderObject
       ..value = value
       ..activeColor = activeColor