diff --git a/include/mapnik/geometry/boost_spirit_karma_adapter.hpp b/include/mapnik/geometry/boost_spirit_karma_adapter.hpp
index fcbd3983b..a6186b8c4 100644
--- a/include/mapnik/geometry/boost_spirit_karma_adapter.hpp
+++ b/include/mapnik/geometry/boost_spirit_karma_adapter.hpp
@@ -23,8 +23,12 @@
 #ifndef MAPNIK_BOOST_SPIRIT_KARMA_ADAPTER_HPP
 #define MAPNIK_BOOST_SPIRIT_KARMA_ADAPTER_HPP
 
+// mapnik
 #include <mapnik/geometry.hpp>
 
+// stl
+#include <cstdint>
+
 namespace boost {
 using mapbox::util::get;
 }