diff --git a/include/mapnik/geom_util.hpp b/include/mapnik/geom_util.hpp
index 3114e59cb..c8fe3220e 100644
--- a/include/mapnik/geom_util.hpp
+++ b/include/mapnik/geom_util.hpp
@@ -32,6 +32,7 @@
 // stl
 #include <cmath>
 #include <vector>
+#include <algorithm>
 
 namespace mapnik
 {