diff --git a/include/mapnik/config.hpp b/include/mapnik/config.hpp
index 37f685c67..857ebf5c9 100644
--- a/include/mapnik/config.hpp
+++ b/include/mapnik/config.hpp
@@ -23,7 +23,7 @@
 #ifndef CONFIG_HPP
 #define CONFIG_HPP
 
-// Window DLL support
+// Windows DLL support
 
 #ifdef _WINDOWS
 # define MAPNIK_DECL __declspec (dllexport)
diff --git a/include/mapnik/proj_transform.hpp b/include/mapnik/proj_transform.hpp
index 5a5e92c13..62fef1d49 100644
--- a/include/mapnik/proj_transform.hpp
+++ b/include/mapnik/proj_transform.hpp
@@ -32,7 +32,7 @@
 
 namespace mapnik {
     
-    class proj_transform : private boost::noncopyable
+    class MAPNIK_DECL proj_transform : private boost::noncopyable
     {
     public:
         proj_transform(projection const& source, 
diff --git a/include/mapnik/projection.hpp b/include/mapnik/projection.hpp
index 90e40819f..bd885ddce 100644
--- a/include/mapnik/projection.hpp
+++ b/include/mapnik/projection.hpp
@@ -43,7 +43,7 @@ namespace mapnik {
             : std::runtime_error("failed to initialize projection with:" + params) {}
     };
     
-    class projection
+    class MAPNIK_DECL projection
     {
         friend class proj_transform;
     public:
diff --git a/include/mapnik/scale_denominator.hpp b/include/mapnik/scale_denominator.hpp
index 4a5c7ee2f..16e3a906a 100644
--- a/include/mapnik/scale_denominator.hpp
+++ b/include/mapnik/scale_denominator.hpp
@@ -21,10 +21,11 @@
  *****************************************************************************/
 
 //$Id$
+#include <mapnik/config.hpp>
 
 namespace mapnik {
  
     class Map;
     class projection;
-    double scale_denominator(Map const& map,projection const& prj); 
+    MAPNIK_DECL double scale_denominator(Map const& map,projection const& prj); 
 }