diff --git a/t/arcs.t b/t/arcs.t
index 44535e94..1ffcd87b 100644
--- a/t/arcs.t
+++ b/t/arcs.t
@@ -59,8 +59,7 @@ use Slic3r::Geometry qw(epsilon scale X Y);
     
     isa_ok $collection1->paths->[0], 'Slic3r::ExtrusionPath::Arc', 'path';
     isa_ok $collection2->paths->[0], 'Slic3r::ExtrusionPath::Arc', 'path';
-
-    $_->deserialize for $collection1->paths->[0], $collection2->paths->[0];
+    
     my $expected_length = scale 7.06858347057701;
     ok abs($collection1->paths->[0]->length - $expected_length) < scale epsilon, 'cw oriented arc has correct length';
     ok abs($collection2->paths->[0]->length - $expected_length) < scale epsilon, 'ccw oriented arc has correct length';
diff --git a/t/serialize.t b/t/serialize.t
index eac51d16..c3d04d4b 100644
--- a/t/serialize.t
+++ b/t/serialize.t
@@ -23,7 +23,7 @@ use Slic3r::Geometry qw(scale);
     }
     my $polyline = Slic3r::Polyline->new($points);
     my $serialized = $polyline->serialize;
-    my $deserialized = $serialized->deserialize;
+    my $deserialized = Slic3r::Polyline->deserialize($serialized);
     is scalar(@$deserialized), scalar(@$points), 'number of deserialized points';
     is_deeply $deserialized, $points, 'deserialized points coordinates';
 }