Index: src/OFStdIOStream_Win32Console.m
==================================================================
--- src/OFStdIOStream_Win32Console.m
+++ src/OFStdIOStream_Win32Console.m
@@ -247,11 +247,11 @@
 		memcpy(_incompleteUTF8Surrogate + _incompleteUTF8SurrogateLen,
 		    buffer, toCopy);
 		_incompleteUTF8SurrogateLen += toCopy;
 
 		if (_incompleteUTF8SurrogateLen < (size_t)UTF8Len)
-			return;
+			return 0;
 
 		UTF8Len = of_string_utf8_decode(
 		    _incompleteUTF8Surrogate, _incompleteUTF8SurrogateLen, &c);
 
 		if (UTF8Len <= 0 || c > 0x10FFFF) {