diff --git a/AFNetworking/AFURLConnectionOperation.m b/AFNetworking/AFURLConnectionOperation.m
index e483f3e..5885369 100644
--- a/AFNetworking/AFURLConnectionOperation.m
+++ b/AFNetworking/AFURLConnectionOperation.m
@@ -739,16 +739,20 @@ didReceiveResponse:(NSURLResponse *)response
             while (totalNumberOfBytesWritten < length) {
                 numberOfBytesWritten = [self.outputStream write:&dataBuffer[0] maxLength:length];
                 if (numberOfBytesWritten == -1) {
-                    [self.connection cancel];
-                    [self performSelector:@selector(connection:didFailWithError:) withObject:self.connection withObject:self.outputStream.streamError];
-                    return;
-                } else {
-                    totalNumberOfBytesWritten += numberOfBytesWritten;
+                    break;
                 }
+
+                totalNumberOfBytesWritten += numberOfBytesWritten;
             }
 
             break;
         }
+
+        if (self.outputStream.streamError) {
+            [self.connection cancel];
+            [self performSelector:@selector(connection:didFailWithError:) withObject:self.connection withObject:self.outputStream.streamError];
+            return;
+        }
     }
     
     dispatch_async(dispatch_get_main_queue(), ^{