diff --git a/include/mapnik/util/geometry_to_wkt.hpp b/include/mapnik/util/geometry_to_wkt.hpp
index 9fd3867e4..6cd433ab4 100644
--- a/include/mapnik/util/geometry_to_wkt.hpp
+++ b/include/mapnik/util/geometry_to_wkt.hpp
@@ -27,6 +27,7 @@
 #include <mapnik/geometry.hpp>
 // stl
 #include <string>
+#include <cstdint>
 
 namespace mapnik {
 namespace util {