diff --git a/engine/src/flutter/shell/platform/darwin/ios/framework/Source/FlutterBinaryMessengerRelay.h b/engine/src/flutter/shell/platform/darwin/ios/framework/Source/FlutterBinaryMessengerRelay.h
index df668dd2a3..af5c82f201 100644
--- a/engine/src/flutter/shell/platform/darwin/ios/framework/Source/FlutterBinaryMessengerRelay.h
+++ b/engine/src/flutter/shell/platform/darwin/ios/framework/Source/FlutterBinaryMessengerRelay.h
@@ -5,7 +5,7 @@
 #import "flutter/shell/platform/darwin/common/framework/Headers/FlutterBinaryMessenger.h"
 #import "flutter/shell/platform/darwin/common/framework/Headers/FlutterMacros.h"
 
-#ifndef NDEBUG
+#if FLUTTER_RUNTIME_MODE == FLUTTER_RUNTIME_MODE_DEBUG
 FLUTTER_EXPORT
 #endif
 @interface FlutterBinaryMessengerRelay : NSObject <FlutterBinaryMessenger>