diff --git a/include/boost/geometry/algorithms/detail/overlay/traversal.hpp b/include/boost/geometry/algorithms/detail/overlay/traversal.hpp
index 78612bca1..ae292f205 100644
--- a/include/boost/geometry/algorithms/detail/overlay/traversal.hpp
+++ b/include/boost/geometry/algorithms/detail/overlay/traversal.hpp
@@ -152,8 +152,8 @@ 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*/, turn_operation_type const& op,
+                         signed_size_type /*turn_index*/, int /*op_index*/) const
     {
         return op.visited.visited();
     }