Index: config/init/hints/mswin32.pm
===================================================================
--- config/init/hints/mswin32.pm	(revision 15877)
+++ config/init/hints/mswin32.pm	(working copy)
@@ -4,6 +4,7 @@
 package init::hints::mswin32;
 
 use strict;
+use Win32;
 
 sub runstep
 {
@@ -26,6 +27,7 @@
         PQ                => '"',
         make_c            => '$(PERL) -e "chdir shift @ARGV; system \'$(MAKE)\', @ARGV; exit $$? >> 8;"',
         ncilib_link_extra => '-def:src/libnci_test.def',
+        build_dir         => Win32::GetShortPathName($conf->data->get('build_dir')),
     );
 
     if ($is_msvc) {