diff --git a/engine/src/flutter/shell/platform/darwin/ios/framework/Source/FlutterPluginAppLifeCycleDelegate.mm b/engine/src/flutter/shell/platform/darwin/ios/framework/Source/FlutterPluginAppLifeCycleDelegate.mm
index 37016945dfd..d13214801ce 100644
--- a/engine/src/flutter/shell/platform/darwin/ios/framework/Source/FlutterPluginAppLifeCycleDelegate.mm
+++ b/engine/src/flutter/shell/platform/darwin/ios/framework/Source/FlutterPluginAppLifeCycleDelegate.mm
@@ -99,16 +99,6 @@ static BOOL isPowerOfTwo(NSUInteger x) {
   return YES;
 }
 
-// Returns the key window's rootViewController, if it's a FlutterViewController.
-// Otherwise, returns nil.
-- (FlutterViewController*)rootFlutterViewController {
-  UIViewController* viewController = [UIApplication sharedApplication].keyWindow.rootViewController;
-  if ([viewController isKindOfClass:[FlutterViewController class]]) {
-    return (FlutterViewController*)viewController;
-  }
-  return nil;
-}
-
 - (void)applicationDidEnterBackground:(UIApplication*)application {
 #if FLUTTER_RUNTIME_MODE == FLUTTER_RUNTIME_MODE_DEBUG
   // The following keeps the Flutter session alive when the device screen locks