diff --git a/lib/Slic3r/Print/Object.pm b/lib/Slic3r/Print/Object.pm
index 0942e5bfc..9967c24d3 100644
--- a/lib/Slic3r/Print/Object.pm
+++ b/lib/Slic3r/Print/Object.pm
@@ -198,7 +198,7 @@ sub slice {
     
     # remove empty layers from bottom
     my $first_object_layer_id = $self->config->raft_layers;
-    while (@{$self->layers} && !@{$self->layers->[$first_object_layer_id]->slices} && !map @{$_->thin_walls}, @{$self->layers->[$first_object_layer_id]->regions}) {
+    while (@{$self->layers} && !@{$self->layers->[$first_object_layer_id]->slices}, @{$self->layers->[$first_object_layer_id]->regions}) {
         splice @{$self->layers}, $first_object_layer_id, 1;
         for (my $i = $first_object_layer_id; $i <= $#{$self->layers}; $i++) {
             $self->layers->[$i]->id($i);