diff -r c3ec048aad63 -r d17b6a80ae08 src/hotspot/os/windows/os_windows.cpp --- a/src/hotspot/os/windows/os_windows.cpp Thu Mar 01 16:35:36 2018 -0500 +++ b/src/hotspot/os/windows/os_windows.cpp Fri Mar 02 03:14:49 2018 -0500 @@ -1537,7 +1537,7 @@ result = _vsnprintf(buf, len, fmt, args); // If output (including NUL terminator) is truncated, the buffer // won't be NUL terminated. Add the trailing NUL specified by C99. - if ((result < 0) || (result >= len)) { + if ((result < 0) || ((size_t)result >= len)) { buf[len - 1] = '\0'; } }