diff --git a/include/mapnik/offset_converter.hpp b/include/mapnik/offset_converter.hpp
index 722040586..0f7501c67 100644
--- a/include/mapnik/offset_converter.hpp
+++ b/include/mapnik/offset_converter.hpp
@@ -40,7 +40,7 @@ namespace mapnik
 {
 
 template <typename Geometry>
-struct MAPNIK_DECL offset_converter
+struct offset_converter
 {
     using size_type = std::size_t;
 
diff --git a/include/mapnik/simplify_converter.hpp b/include/mapnik/simplify_converter.hpp
index e9a88c4cf..e217eba41 100644
--- a/include/mapnik/simplify_converter.hpp
+++ b/include/mapnik/simplify_converter.hpp
@@ -90,7 +90,7 @@ struct sleeve
 };
 
 template <typename Geometry>
-struct MAPNIK_DECL simplify_converter
+struct simplify_converter
 {
 public:
     simplify_converter(Geometry & geom)