diff --git a/src/Simplex_tree/include/gudhi/Simplex_tree.h b/src/Simplex_tree/include/gudhi/Simplex_tree.h
index 704714fc5..ce8d655bf 100644
--- a/src/Simplex_tree/include/gudhi/Simplex_tree.h
+++ b/src/Simplex_tree/include/gudhi/Simplex_tree.h
@@ -1213,7 +1213,7 @@ class Simplex_tree {
         return filtration(sh) == Filtration_simplex_base_real::get_infinity();
       });
     } else {
-      initialize_filtration(is_before_in_totally_ordered_filtration(this), [](Simplex_handle sh) -> bool {
+      initialize_filtration(is_before_in_totally_ordered_filtration(this), [](Simplex_handle) -> bool {
         return false;
       });
     }