Index: Modules/posixmodule.c
===================================================================
--- Modules/posixmodule.c	(revision 87117)
+++ Modules/posixmodule.c	(working copy)
@@ -1037,6 +1037,7 @@
     FILE_TIME_to_time_t_nsec(&info->ftLastWriteTime, &result->st_mtime, &result->st_mtime_nsec);
     FILE_TIME_to_time_t_nsec(&info->ftLastAccessTime, &result->st_atime, &result->st_atime_nsec);
     result->st_nlink = info->nNumberOfLinks;
+    result->st_dev = result->st_rdev = info->dwVolumeSerialNumber;
     result->st_ino = (((__int64)info->nFileIndexHigh)<<32) + info->nFileIndexLow;
     if (reparse_tag == IO_REPARSE_TAG_SYMLINK) {
         /* first clear the S_IFMT bits */