I've just updated coreutils. I don't use test versions. So I have $ uname --version uname (GNU coreutils) 8.32 Packaged by Cygwin (8.32-1) Now on 32-bit Cygwin I get $ uname -s CYGWIN_NT-10.0-19044-WOW64 [ previously CYGWIN_NT-10.0-WOW ] And on 64-bit Cygwin I get $ uname -s CYGWIN_NT-10.0-19044 [ previously CYGWIN_NT-10.0 ] Packaging error? Fergus