diff --git a/include/mapnik/quad_tree.hpp b/include/mapnik/quad_tree.hpp
index 86a342f2d..bad8b3b21 100644
--- a/include/mapnik/quad_tree.hpp
+++ b/include/mapnik/quad_tree.hpp
@@ -32,6 +32,8 @@
 #include <vector>
 #include <type_traits>
 
+#include <cstring>
+
 namespace mapnik
 {
 template <typename T>