diff --git a/lib/Slic3r.pm b/lib/Slic3r.pm
index d078e1696..4e6d8fd48 100644
--- a/lib/Slic3r.pm
+++ b/lib/Slic3r.pm
@@ -3,7 +3,7 @@ package Slic3r;
 use strict;
 use warnings;
 
-our $VERSION = "0.5.5a";
+our $VERSION = "0.5.5b";
 
 our $debug = 0;
 sub debugf {
diff --git a/lib/Slic3r/Print.pm b/lib/Slic3r/Print.pm
index 1b72b6302..916a99ea9 100644
--- a/lib/Slic3r/Print.pm
+++ b/lib/Slic3r/Print.pm
@@ -113,13 +113,13 @@ sub new_from_mesh {
         my (@upper_surfaces, @lower_surfaces);
         for (my $j = $i+1; $j <= $#{$print->layers}; $j++) {
             if (!$print->layers->[$j]->slicing_errors) {
-                @upper_surfaces = @{$print->layers->[$j]->surfaces};
+                @upper_surfaces = @{$print->layers->[$j]->slices};
                 last;
             }
         }
         for (my $j = $i-1; $j >= 0; $j--) {
             if (!$print->layers->[$j]->slicing_errors) {
-                @lower_surfaces = @{$print->layers->[$j]->surfaces};
+                @lower_surfaces = @{$print->layers->[$j]->slices};
                 last;
             }
         }
@@ -132,7 +132,7 @@ sub new_from_mesh {
             [ map $_->expolygon->holes, @upper_surfaces, @lower_surfaces, ],
         );
         
-        @{$layer->surfaces} = map Slic3r::Surface->cast_from_expolygon
+        @{$layer->slices} = map Slic3r::Surface->cast_from_expolygon
             ($_, surface_type => 'internal'),
             @$diff;
     }