diff --git a/shell/platform/darwin/ios/framework/Source/FlutterObservatoryPublisher.mm b/shell/platform/darwin/ios/framework/Source/FlutterObservatoryPublisher.mm
index 9d52b5de029eb..147ef0d1171ff 100644
--- a/shell/platform/darwin/ios/framework/Source/FlutterObservatoryPublisher.mm
+++ b/shell/platform/darwin/ios/framework/Source/FlutterObservatoryPublisher.mm
@@ -80,6 +80,7 @@ - (void)stopService {
   }
 #else   // TARGET_IPHONE_SIMULATOR
   [_netService.get() stop];
+  [_netService.get() setDelegate:nil];
 #endif  // TARGET_IPHONE_SIMULATOR
 }