diff --git a/README.md b/README.md
index 9d5fb45..d207d57 100644
--- a/README.md
+++ b/README.md
@@ -124,8 +124,8 @@ NSMutableURLRequest *request = [httpClient multipartFormRequestWithMethod:@"POST
 }];
 
 AFHTTPRequestOperation *operation = [[[AFHTTPRequestOperation alloc] initWithRequest:request] autorelease];
-[operation setUploadProgressBlock:^(NSInteger bytesWritten, NSInteger totalBytesWritten, NSInteger totalBytesExpectedToWrite) {
-    NSLog(@"Sent %d of %d bytes", totalBytesWritten, totalBytesExpectedToWrite);
+[operation setUploadProgressBlock:^(NSInteger bytesWritten, long long totalBytesWritten, long long totalBytesExpectedToWrite) {
+    NSLog(@"Sent %lld of %lld bytes", totalBytesWritten, totalBytesExpectedToWrite);
 }];
 [operation start];
 ```