Index: src/OFHTTPClient.m
==================================================================
--- src/OFHTTPClient.m
+++ src/OFHTTPClient.m
@@ -412,15 +412,15 @@
 	if (requestType == OF_HTTP_REQUEST_TYPE_POST) {
 		OFString *contentType = [request MIMEType];
 
 		if (contentType == nil)
 			contentType = @"application/x-www-form-urlencoded; "
-			    @"charset=UTF-8\r\n";
+			    @"charset=UTF-8";
 
 		[requestString appendFormat:
 		    @"Content-Type: %@\r\n"
-		    @"Content-Length: %d\r\n",
+		    @"Content-Length: %zu\r\n",
 		    contentType, [POSTData count] * [POSTData itemSize]];
 	}
 
 	if ([request protocolVersion].major == 1 &&
 	    [request protocolVersion].minor == 0)