diff --git a/include/boost/geometry/algorithms/detail/overlay/traversal.hpp b/include/boost/geometry/algorithms/detail/overlay/traversal.hpp
index 381ba6052..6ad239df7 100644
--- a/include/boost/geometry/algorithms/detail/overlay/traversal.hpp
+++ b/include/boost/geometry/algorithms/detail/overlay/traversal.hpp
@@ -153,8 +153,8 @@ struct traversal
         }
     }
 
-  inline bool is_visited(turn_type const& /*turn*/, turn_operation_type const& op,
-                         signed_size_type /*turn_index*/, int /*op_index*/) const
+    inline bool is_visited(turn_type const& , turn_operation_type const& op,
+                         signed_size_type , int) const
     {
         return op.visited.visited();
     }