diff --git a/shell/platform/darwin/macos/framework/Headers/FlutterViewController.h b/shell/platform/darwin/macos/framework/Headers/FlutterViewController.h
index 53e26fbad4da6..b48c2b5312e06 100644
--- a/shell/platform/darwin/macos/framework/Headers/FlutterViewController.h
+++ b/shell/platform/darwin/macos/framework/Headers/FlutterViewController.h
@@ -115,6 +115,6 @@ FLUTTER_DARWIN_EXPORT
  * }
  * ```
  */
-@property(readwrite, nonatomic, nullable) NSColor* backgroundColor;
+@property(readwrite, nonatomic, nullable, strong) NSColor* backgroundColor;
 
 @end