diff --git a/include/omath/collision/epa_algorithm.hpp b/include/omath/collision/epa_algorithm.hpp
index 1875176..ee349fa 100644
--- a/include/omath/collision/epa_algorithm.hpp
+++ b/include/omath/collision/epa_algorithm.hpp
@@ -191,7 +191,8 @@ namespace omath::collision
         };
         struct HeapCmp final
         {
-            bool operator()(const HeapItem& lhs, const HeapItem& rhs) const noexcept
+            [[nodiscard]]
+            static bool operator()(const HeapItem& lhs, const HeapItem& rhs) const noexcept
             {
                 return lhs.d > rhs.d; // min-heap by distance
             }