diff --git a/test/type_tests.cpp b/test/type_tests.cpp
index 3c494b5c..56f8c490 100644
--- a/test/type_tests.cpp
+++ b/test/type_tests.cpp
@@ -5,6 +5,8 @@
 
 #include <boost/unordered_set.hpp>
 #include <boost/unordered_map.hpp>
+
+#include <string>
 #include <boost/type_traits/is_same.hpp>
 #include <boost/iterator/iterator_traits.hpp>
 #include <boost/mpl/assert.hpp>