diff --git a/include/omath/collision/epa_algorithm.hpp b/include/omath/collision/epa_algorithm.hpp
index 7b5a678..0496b87 100644
--- a/include/omath/collision/epa_algorithm.hpp
+++ b/include/omath/collision/epa_algorithm.hpp
@@ -99,7 +99,7 @@ namespace omath::collision
                 const int new_idx = static_cast<int>(vertexes.size());
                 vertexes.emplace_back(p);
 
-                auto [to_delete, boundary] = mark_visible_and_collect_horizon(faces, p);
+                const auto [to_delete, boundary] = mark_visible_and_collect_horizon(faces, p);
 
                 erase_marked(faces, to_delete);