--- a/t/conf/modperl_extra.pl
+++ b/t/conf/modperl_extra.pl
@@ -136,6 +136,8 @@
 sub test_modperl_env {
     # see t/response/TestModperl/env.pm
     $ENV{MODPERL_EXTRA_PL} = __FILE__;
+    $ENV{TMPDIR} = __FILE__;
+    $ENV{TMPDIR} =~ s,/work/.*,/temp,;
 }
 
 1;