Hi Behdad, When compiling with MSVC, we have "#define snprintf _snprintf" in hb-private.hh. However, it seems that MSVC 2015 now provides snprintf itself, so I think we should use that directly instead, and make the #define conditional on the value of _MSC_VER. (See patch 9 in https://bugzilla.mozilla.org/show_bug.cgi?id=1119776.) Thanks, JK