diff --git a/t/config.t b/t/config.t
index 7950dbb18..7f85dae84 100644
--- a/t/config.t
+++ b/t/config.t
@@ -1,4 +1,4 @@
-use Test::More tests => 2;
+use Test::More tests => 1;
 use strict;
 use warnings;
 
@@ -10,13 +10,6 @@ BEGIN {
 use Slic3r;
 use Slic3r::Test;
 
-{
-    my $config = Slic3r::Config->new_from_defaults;
-    $config->set('layer_height', 0.123);
-    $config->setenv;
-    is $ENV{SLIC3R_LAYER_HEIGHT}, '0.123', 'setenv';
-}
-
 {
     my $config = Slic3r::Config->new_from_defaults;
     $config->set('perimeter_extrusion_width', '250%');