diff --git a/xs/t/15_config.t b/xs/t/15_config.t
index f6efc8a5d..65854dca1 100644
--- a/xs/t/15_config.t
+++ b/xs/t/15_config.t
@@ -107,6 +107,7 @@ foreach my $config (Slic3r::Config->new, Slic3r::Config::Static::new_FullPrintCo
     is_deeply [ map $_->pp, @{$config->get('extruder_offset')} ], [[10,20],[30,45]], 'set/get points';
     $config->set('extruder_offset', [Slic3r::Pointf->new(10,20),Slic3r::Pointf->new(30,45)]);
     is_deeply [ map $_->pp, @{$config->get('extruder_offset')} ], [[10,20],[30,45]], 'set/get points';
+    $config->set_deserialize('extruder_offset', $config->serialize('extruder_offset'));
     is $config->serialize('extruder_offset'), '10x20,30x45', 'serialize points';
     $config->set_deserialize('extruder_offset', '20x10');
     is_deeply [ map $_->pp, @{$config->get('extruder_offset')} ], [[20,10]], 'deserialize points';