diff --git a/include/osgSim/ShapeAttribute b/include/osgSim/ShapeAttribute
index 8b1103d30..a0acbb21a 100644
--- a/include/osgSim/ShapeAttribute
+++ b/include/osgSim/ShapeAttribute
@@ -20,11 +20,12 @@
 
 #include <osg/Object>
 
+#include <osgSim/Export>
 
 namespace osgSim
 {
 
-class ShapeAttribute
+class OSGSIM_EXPORT ShapeAttribute
 {
     public:
         
@@ -72,7 +73,7 @@ class ShapeAttribute
         
 };
 
-class ShapeAttributeList : public osg::Object, public std::vector<ShapeAttribute>
+class OSGSIM_EXPORT ShapeAttributeList : public osg::Object, public std::vector<ShapeAttribute>
 {
     public:
         META_Object(osgSim, ShapeAttributeList)