Index: src/OFHTTPServer.m
==================================================================
--- src/OFHTTPServer.m
+++ src/OFHTTPServer.m
@@ -443,11 +443,11 @@
 
 	if ([line length] == 0) {
 		size_t contentLength;
 
 		@try {
-			contentLength = [[_headers
+			contentLength = (size_t)[[_headers
 			    objectForKey: @"Content-Length"] decimalValue];
 		} @catch (OFInvalidFormatException *e) {
 			return [self sendErrorAndClose: 400];
 		}