diff --git a/binary_search_test.cpp b/binary_search_test.cpp
index ddad61a..7fece46 100644
--- a/binary_search_test.cpp
+++ b/binary_search_test.cpp
@@ -98,7 +98,7 @@ template <class T>
 void sort_by_value(T& x);
 
 template <class T>
-void sort_by_value_(T& v, ...)
+void sort_by_value_(T& v, long)
 {
     std::sort(v.begin(), v.end(), cmp());
 }