diff --git a/counting_iterator_example.cpp b/counting_iterator_example.cpp
index 87f946d..7b77992 100644
--- a/counting_iterator_example.cpp
+++ b/counting_iterator_example.cpp
@@ -5,6 +5,7 @@
 
 
 #include <boost/config.hpp>
+#include <algorithm>
 #include <iostream>
 #include <iterator>
 #include <vector>