diff --git a/include/osgUtil/Optimizer b/include/osgUtil/Optimizer
index becc14cd9..863a13889 100644
--- a/include/osgUtil/Optimizer
+++ b/include/osgUtil/Optimizer
@@ -44,7 +44,7 @@ class OSGUTIL_EXPORT Optimizer
         /** Flatten Static Trasform nodes by applying their transform to the
           * geometry on the leaves of the scene graph, then removing the 
           * now redundent transforms.*/        
-        class FlattenStaticTransformsVisitor : public osg::NodeVisitor
+        class OSGUTIL_EXPORT FlattenStaticTransformsVisitor : public osg::NodeVisitor
         {
             public:
 
@@ -66,7 +66,7 @@ class OSGUTIL_EXPORT Optimizer
         };
 
         /** Remove rendundent nodes, such as groups with one single child.*/
-        class RemoveRedundentNodesVisitor : public osg::NodeVisitor
+        class OSGUTIL_EXPORT RemoveRedundentNodesVisitor : public osg::NodeVisitor
         {
             public:
 
@@ -83,7 +83,7 @@ class OSGUTIL_EXPORT Optimizer
 
         /** Optimize the LOD groups, by combining adjacent LOD's which have
           * complementary ranges.*/
-        class CombineLODsVisitor : public osg::NodeVisitor
+        class OSGUTIL_EXPORT CombineLODsVisitor : public osg::NodeVisitor
         {
             public:
 
@@ -101,7 +101,7 @@ class OSGUTIL_EXPORT Optimizer
         /** Optimize State in the scene graph by removing duplicate state,
           * replacing it with shared instances, both for StateAttributes,
           * and whole StateSets.*/
-        class StateVisitor : public osg::NodeVisitor
+        class OSGUTIL_EXPORT StateVisitor : public osg::NodeVisitor
         {
             public: