diff --git a/01_introduction_to_algorithms/c++11/01_binary_search.cpp b/01_introduction_to_algorithms/c++11/01_binary_search.cpp
index f0e06e51..b56f945f 100644
--- a/01_introduction_to_algorithms/c++11/01_binary_search.cpp
+++ b/01_introduction_to_algorithms/c++11/01_binary_search.cpp
@@ -5,7 +5,7 @@ using std::cout;
 using std::endl;
 
 template <typename T>
-int binary_search(const std::vector<T>& list, const int& item) {
+int binary_search(const std::vector<T>& list, const T& item) {
     int low = 0;
     int high = list.size() - 1;