diff --git a/YTVimeoExtractor/YTVimeoExtractor.m b/YTVimeoExtractor/YTVimeoExtractor.m
index cce2a2c..0912b07 100644
--- a/YTVimeoExtractor/YTVimeoExtractor.m
+++ b/YTVimeoExtractor/YTVimeoExtractor.m
@@ -107,7 +107,7 @@ -(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLRespons
         [connection cancel];
     }
     
-    NSUInteger capacity = (response.expectedContentLength != NSURLResponseUnknownLength) ? response.expectedContentLength : 0;
+    NSUInteger capacity = (response.expectedContentLength != NSURLResponseUnknownLength) ? (uint)response.expectedContentLength : 0;
     self.buffer = [[NSMutableData alloc] initWithCapacity:capacity];
 }