diff --git a/utils/shapeindex/quadtree.hpp b/utils/shapeindex/quadtree.hpp
index 96672c792..46a283c02 100644
--- a/utils/shapeindex/quadtree.hpp
+++ b/utils/shapeindex/quadtree.hpp
@@ -27,6 +27,7 @@
 #include <vector>
 #include <fstream>
 #include <iostream>
+#include <memory>
 // mapnik
 #include <mapnik/box2d.hpp>