--- t/22_installdirs.t	2012-03-02 00:00:48.000000000 +1100
+++ t/22_installdirs-edit.t	2012-06-06 11:26:54.998603586 +1000
@@ -13,6 +13,8 @@
 
 plan tests => 24;
 
+undef $ENV{PERL_MM_OPT}; # PERL_MM_OPT='INSTALLDIRS=perl' can interfere
+
 SCOPE: {
 	ok( create_dist('Foo', { 'Makefile.PL' => <<"END_DSL" }), 'create_dist' );
 use inc::Module::Install 0.81;