diff --git a/AFNetworking/AFHTTPRequestOperation.m b/AFNetworking/AFHTTPRequestOperation.m
index 0247377..6cff354 100644
--- a/AFNetworking/AFHTTPRequestOperation.m
+++ b/AFNetworking/AFHTTPRequestOperation.m
@@ -154,6 +154,8 @@ static NSThread *_networkRequestThread = nil;
         }
     }];
     
+    operation.outputStream = outputStream;
+    
     return operation;
 }