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';
     }
   }