diff --git a/lib/Slic3r/Print/Object.pm b/lib/Slic3r/Print/Object.pm
index 5a450a9ea..26317621c 100644
--- a/lib/Slic3r/Print/Object.pm
+++ b/lib/Slic3r/Print/Object.pm
@@ -34,18 +34,6 @@ sub support_layers {
     return [ map $self->get_support_layer($_), 0..($self->support_layer_count - 1) ];
 }
 
-# This will assign a type (top/bottom/internal) to $layerm->slices
-# and transform $layerm->fill_surfaces from expolygon 
-# to typed top/bottom/internal surfaces;
-sub detect_surfaces_type {
-    my ($self) = @_;
-    
-    # prerequisites
-    $self->slice;
-    
-    $self->_detect_surfaces_type;
-}
-
 sub prepare_infill {
     my ($self) = @_;
     
diff --git a/xs/src/libslic3r/PrintObject.cpp b/xs/src/libslic3r/PrintObject.cpp
index 35279aac4..ccbc7a00a 100644
--- a/xs/src/libslic3r/PrintObject.cpp
+++ b/xs/src/libslic3r/PrintObject.cpp
@@ -329,11 +329,14 @@ PrintObject::has_support_material() const
         || this->config.support_material_enforce_layers > 0;
 }
 
+// This will assign a type (top/bottom/internal) to layerm->slices
+// and transform layerm->fill_surfaces from expolygon 
+// to typed top/bottom/internal surfaces;
 void
 PrintObject::detect_surfaces_type()
 {
     // prerequisites
-    // this->slice();
+    this->slice();
     
     if (this->state.is_done(posDetectSurfaces)) return;
     this->state.set_started(posDetectSurfaces);
diff --git a/xs/xsp/Print.xsp b/xs/xsp/Print.xsp
index e5cceda9b..89d84df05 100644
--- a/xs/xsp/Print.xsp
+++ b/xs/xsp/Print.xsp
@@ -126,7 +126,7 @@ _constant()
     void set_step_started(PrintObjectStep step)
         %code%{ THIS->state.set_started(step); %};
     
-    %name{_detect_surfaces_type} void detect_surfaces_type();
+    void detect_surfaces_type();
     void process_external_surfaces();
     void bridge_over_infill();
     void combine_infill();