diff --git a/lib/utils/include/utils/containers.h b/lib/utils/include/utils/containers.h
index 06c297f35d..fd00745a4b 100644
--- a/lib/utils/include/utils/containers.h
+++ b/lib/utils/include/utils/containers.h
@@ -518,12 +518,9 @@ std::vector<T> sorted_by(std::unordered_set<T> const &s, F const &f) {
 
 template <typename T, typename F>
 void inplace_sorted_by(std::vector<T> &v, F const &f) {
-  struct {
-    bool operator()(T const &lhs, T const &rhs) {
-      return f(lhs, rhs);
-    }
-  } custom_comparator;
-
+  auto custom_comparator = [&](T const &lhs, T const &rhs) -> bool {
+    return f(lhs, rhs);
+  };
   std::sort(v.begin(), v.end(), custom_comparator);
 }