diff --git a/mediapipe/tasks/ios/vision/core/sources/MPPVisionTaskRunner.h b/mediapipe/tasks/ios/vision/core/sources/MPPVisionTaskRunner.h
index b7f4af7d..325e0622 100644
--- a/mediapipe/tasks/ios/vision/core/sources/MPPVisionTaskRunner.h
+++ b/mediapipe/tasks/ios/vision/core/sources/MPPVisionTaskRunner.h
@@ -44,7 +44,7 @@ NS_ASSUME_NONNULL_BEGIN
                                            runningMode:(MPPRunningMode)runningMode
                                        packetsCallback:
                                            (mediapipe::tasks::core::PacketsCallback)packetsCallback
-                                                 error:(NSError **)error;
+                                                 error:(NSError **)error NS_DESIGNATED_INITIALIZER;
 
 - (instancetype)init NS_UNAVAILABLE;