diff --git a/mediapipe/tasks/ios/core/sources/MPPTaskInfo.h b/mediapipe/tasks/ios/core/sources/MPPTaskInfo.h
index fca660fae..4c01787a8 100644
--- a/mediapipe/tasks/ios/core/sources/MPPTaskInfo.h
+++ b/mediapipe/tasks/ios/core/sources/MPPTaskInfo.h
@@ -55,7 +55,7 @@ NS_ASSUME_NONNULL_BEGIN
                         outputStreams:(NSArray<NSString *> *)outputStreams
                           taskOptions:(id<MPPTaskOptionsProtocol>)taskOptions
                    enableFlowLimiting:(BOOL)enableFlowLimiting
-                                error:(NSError **)error;
+                                error:(NSError **)error NS_DESIGNATED_INITIALIZER;
 
 /**
  * Creates a MediaPipe Task  protobuf message from the MPPTaskInfo instance.
diff --git a/mediapipe/tasks/ios/core/sources/MPPTaskRunner.h b/mediapipe/tasks/ios/core/sources/MPPTaskRunner.h
index 64e34b82e..e07cb344d 100644
--- a/mediapipe/tasks/ios/core/sources/MPPTaskRunner.h
+++ b/mediapipe/tasks/ios/core/sources/MPPTaskRunner.h
@@ -24,6 +24,7 @@ NS_ASSUME_NONNULL_BEGIN
  * This class is used to create and call appropriate methods on the C++ Task Runner.
  */
 @interface MPPTaskRunner : NSObject
+
 /**
  * Initializes a new `MPPTaskRunner` with the mediapipe task graph config proto.
  *
@@ -32,7 +33,7 @@ NS_ASSUME_NONNULL_BEGIN
  * @return An instance of `MPPTaskRunner` initialized to the given graph config proto.
  */
 - (instancetype)initWithCalculatorGraphConfig:(mediapipe::CalculatorGraphConfig)graphConfig
-                                        error:(NSError **)error;
+                                        error:(NSError **)error NS_DESIGNATED_INITIALIZER;
 
 - (absl::StatusOr<mediapipe::tasks::core::PacketMap>)process:(const mediapipe::tasks::core::PacketMap&)packetMap error:(NSError **)error;