diff --git a/include/mapnik/symbolizer.hpp b/include/mapnik/symbolizer.hpp
index 3a0f0ea68..92e23855f 100644
--- a/include/mapnik/symbolizer.hpp
+++ b/include/mapnik/symbolizer.hpp
@@ -30,7 +30,7 @@
 namespace mapnik 
 {
 
-    class symbolizer_with_image {
+    class MAPNIK_DECL symbolizer_with_image {
         public:
             boost::shared_ptr<ImageData32> get_image() const;
             const std::string & get_filename() const;