diff --git a/algorithm/tarjan.h b/algorithm/tarjan.h
index b6223d7..fcd0ab2 100644
--- a/algorithm/tarjan.h
+++ b/algorithm/tarjan.h
@@ -56,7 +56,7 @@ void Tarjan<T>::strongConnect(const T& v) {
     std::vector<T> SCC;
     bool finished = false;
     do {
-      const auto& w = S.top();
+      const auto w = S.top();
       S.pop();
       vp[w].onStack = false;
       SCC.push_back(w);