diff --git a/xs/t/15_config.t b/xs/t/15_config.t
index a79fe7a37..6326cae10 100644
--- a/xs/t/15_config.t
+++ b/xs/t/15_config.t
@@ -4,7 +4,7 @@ use strict;
 use warnings;
 
 use Slic3r::XS;
-use Test::More tests => 146;
+use Test::More tests => 144;
 
 foreach my $config (Slic3r::Config->new, Slic3r::Config::Static::new_FullPrintConfig) {
     $config->set('layer_height', 0.3);
@@ -70,9 +70,10 @@ foreach my $config (Slic3r::Config->new, Slic3r::Config::Static::new_FullPrintCo
     ok abs($config->get('first_layer_height') - 0.3) < 1e-4, 'set/get absolute floatOrPercent';
     is $config->opt_serialize('first_layer_height'), '0.3', 'serialize absolute floatOrPercent';
     
-    $config->set('first_layer_height', $config->get('layer_height'));
-    $config->get_abs_value('first_layer_height');
-    ok abs($config->get_abs_value('first_layer_height') - 0.15) < 1e-4, 'set/get relative floatOrPercent';
+# This is no more supported after first_layer_height was moved from PrintObjectConfig to PrintConfig.
+#    $config->set('first_layer_height', $config->get('layer_height'));
+#    $config->get_abs_value('first_layer_height');
+#    ok abs($config->get_abs_value('first_layer_height') - 0.15) < 1e-4, 'set/get relative floatOrPercent';
 #    is $config->opt_serialize('first_layer_height'), '50%', 'serialize relative floatOrPercent';
     
     # Uh-oh, we have no point option to test at the moment