diff --git a/Arrangement_on_surface_2/include/CGAL/Arr_dcel_base.h b/Arrangement_on_surface_2/include/CGAL/Arr_dcel_base.h
index be23e898b97..9ca21d78aa0 100644
--- a/Arrangement_on_surface_2/include/CGAL/Arr_dcel_base.h
+++ b/Arrangement_on_surface_2/include/CGAL/Arr_dcel_base.h
@@ -528,12 +528,13 @@ public:
       this->p_v = v;
   }
 
-  /*! Check whether the halfedge lies on the boundary of an inner CCB. */
-  bool is_on_inner_ccb () const
+  /*! Check whether the halfedge lies on the boundary of an outer CCB. */
+  bool is_on_outer_ccb () const
   {
-    return (_is_lsb_set (this->p_comp));
+    return (!_is_lsb_set (this->p_comp));
   }
 
+
   /*!
    * Get an incident outer CCB (const version).
    * \pre The edge does not lie on an inner CCB.
@@ -561,6 +562,12 @@ public:
     this->p_comp = oc;
   }
 
+  /*! Check whether the halfedge lies on the boundary of an inner CCB. */
+  bool is_on_inner_ccb () const
+  {
+    return (_is_lsb_set (this->p_comp));
+  }
+
   /*!
    * Get an incident inner CCB (const version).
    * \pre The edge lies on an inner CCB.