diff --git a/lib/Slic3r/Print/Object.pm b/lib/Slic3r/Print/Object.pm
index 5a7091121..56279223a 100644
--- a/lib/Slic3r/Print/Object.pm
+++ b/lib/Slic3r/Print/Object.pm
@@ -32,14 +32,6 @@ sub support_layers {
     return [ map $self->get_support_layer($_), 0..($self->support_layer_count - 1) ];
 }
 
-# this is the *total* layer count (including support layers)
-# this value is not supposed to be compared with $layer->id
-# since they have different semantics
-sub total_layer_count {
-    my $self = shift;
-    return $self->layer_count + $self->support_layer_count;
-}
-
 # this should be idempotent
 sub slice {
     my $self = shift;
diff --git a/xs/src/libslic3r/Print.hpp b/xs/src/libslic3r/Print.hpp
index 868a3d775..27ba83780 100644
--- a/xs/src/libslic3r/Print.hpp
+++ b/xs/src/libslic3r/Print.hpp
@@ -114,13 +114,14 @@ class PrintObject
     // adds region_id, too, if necessary
     void add_region_volume(int region_id, int volume_id);
 
-    size_t layer_count();
+    size_t total_layer_count() const;
+    size_t layer_count() const;
     void clear_layers();
     Layer* get_layer(int idx);
     Layer* add_layer(int id, coordf_t height, coordf_t print_z, coordf_t slice_z);
     void delete_layer(int idx);
 
-    size_t support_layer_count();
+    size_t support_layer_count() const;
     void clear_support_layers();
     SupportLayer* get_support_layer(int idx);
     SupportLayer* add_support_layer(int id, coordf_t height, coordf_t print_z, coordf_t slice_z);
diff --git a/xs/src/libslic3r/PrintObject.cpp b/xs/src/libslic3r/PrintObject.cpp
index e8d4eb788..16c904cfb 100644
--- a/xs/src/libslic3r/PrintObject.cpp
+++ b/xs/src/libslic3r/PrintObject.cpp
@@ -131,8 +131,17 @@ PrintObject::add_region_volume(int region_id, int volume_id)
     region_volumes[region_id].push_back(volume_id);
 }
 
+/*  This is the *total* layer count (including support layers)
+    this value is not supposed to be compared with Layer::id
+    since they have different semantics */
 size_t
-PrintObject::layer_count()
+PrintObject::total_layer_count() const
+{
+    return this->layer_count() + this->support_layer_count();
+}
+
+size_t
+PrintObject::layer_count() const
 {
     return this->layers.size();
 }
@@ -167,7 +176,7 @@ PrintObject::delete_layer(int idx)
 }
 
 size_t
-PrintObject::support_layer_count()
+PrintObject::support_layer_count() const
 {
     return this->support_layers.size();
 }
diff --git a/xs/xsp/Print.xsp b/xs/xsp/Print.xsp
index 60135f4a1..2213a9511 100644
--- a/xs/xsp/Print.xsp
+++ b/xs/xsp/Print.xsp
@@ -88,6 +88,7 @@ _constant()
     void set_layer_height_ranges(t_layer_height_ranges layer_height_ranges)
         %code%{ THIS->layer_height_ranges = layer_height_ranges; %};
 
+    size_t total_layer_count();
     size_t layer_count();
     void clear_layers();
     Ref<Layer> get_layer(int idx);