diff --git a/xs/src/libslic3r/SurfaceCollection.hpp b/xs/src/libslic3r/SurfaceCollection.hpp
index 02b54a463..0fb30a734 100644
--- a/xs/src/libslic3r/SurfaceCollection.hpp
+++ b/xs/src/libslic3r/SurfaceCollection.hpp
@@ -78,6 +78,8 @@ class SurfaceCollection
     Surfaces::iterator end() { return this->surfaces.end();}
     Surfaces::const_iterator cbegin() const { return this->surfaces.cbegin();}
     Surfaces::const_iterator cend() const { return this->surfaces.cend();}
+    Surfaces::const_iterator begin() const { return this->surfaces.cbegin();}
+    Surfaces::const_iterator end() const { return this->surfaces.cend();}
 };
 
 }