diff --git a/lib/Dist/Zilla/Tester.pm b/lib/Dist/Zilla/Tester.pm
index 982aa23c3..edff8d01c 100644
--- a/lib/Dist/Zilla/Tester.pm
+++ b/lib/Dist/Zilla/Tester.pm
@@ -162,7 +162,7 @@ sub minter { 'Dist::Zilla::Tester::_Minter' }
 
     local $ENV{DZIL_GLOBAL_CONFIG_ROOT};
     $ENV{DZIL_GLOBAL_CONFIG_ROOT} = $tester_arg->{global_config_root}
-      if defined $ENV{DZIL_GLOBAL_CONFIG_ROOT};
+      if defined $tester_arg->{global_config_root};
 
     my $zilla = $self->$orig($arg);
 
@@ -276,9 +276,7 @@ sub minter { 'Dist::Zilla::Tester::_Minter' }
 
     my $global_config_root = Path::Class::dir($tester_arg->{global_config_root})->absolute;
 
-    local $ENV{DZIL_GLOBAL_CONFIG_ROOT};
-    $ENV{DZIL_GLOBAL_CONFIG_ROOT} = $tester_arg->{global_config_root}
-      if defined $ENV{DZIL_GLOBAL_CONFIG_ROOT};
+    local $ENV{DZIL_GLOBAL_CONFIG_ROOT} = $global_config_root;
 
     my $global_stashes = $self->_setup_global_config(
       $global_config_root,