diff --git a/AsyncDisplayKit/Details/ASBasicImageDownloader.mm b/AsyncDisplayKit/Details/ASBasicImageDownloader.mm
index 983d5bc8..73301919 100644
--- a/AsyncDisplayKit/Details/ASBasicImageDownloader.mm
+++ b/AsyncDisplayKit/Details/ASBasicImageDownloader.mm
@@ -230,7 +230,7 @@ static const char *kContextKey = NSStringFromClass(ASBasicImageDownloaderContext
 
 - (id)downloadImageWithURL:(NSURL *)URL
              callbackQueue:(dispatch_queue_t)callbackQueue
-          downloadProgress:(void (^)(CGFloat))downloadProgressBlock
+     downloadProgressBlock:(void (^)(CGFloat))downloadProgressBlock
                 completion:(void (^)(CGImageRef, NSError *))completion
 {
   ASBasicImageDownloaderContext *context = [ASBasicImageDownloaderContext contextForURL:URL];