diff --git a/mediapipe/tasks/ios/vision/object_detector/sources/MPPObjectDetector.mm b/mediapipe/tasks/ios/vision/object_detector/sources/MPPObjectDetector.mm
index 47ee77dd5..f975d9743 100644
--- a/mediapipe/tasks/ios/vision/object_detector/sources/MPPObjectDetector.mm
+++ b/mediapipe/tasks/ios/vision/object_detector/sources/MPPObjectDetector.mm
@@ -82,7 +82,7 @@ static NSString *const kTaskName = @"objectDetector";
 
   MPPObjectDetectorResult *result = [MPPObjectDetectorResult
       objectDetectorResultWithDetectionsPacket:
-                               outputPacketMap:[kDetectionsStreamName.cppString]];
+                               outputPacketMap[kDetectionsStreamName.cppString]];
 
   NSInteger timeStampInMilliseconds =
       outputPacketMap[kImageOutStreamName.cppString].Timestamp().Value() /