diff --git a/iterator_adaptor_test.cpp b/iterator_adaptor_test.cpp
index 9366776..eb22f0b 100644
--- a/iterator_adaptor_test.cpp
+++ b/iterator_adaptor_test.cpp
@@ -14,6 +14,7 @@
 
 #include <iostream>
 
+#include <algorithm>
 #include <functional>
 #include <boost/iterator_adaptors.hpp>
 #include <boost/iterator_tests.hpp>