diff --git a/include/osg/Texture b/include/osg/Texture
index 05b010e2e..c708c5e90 100644
--- a/include/osg/Texture
+++ b/include/osg/Texture
@@ -233,7 +233,7 @@ class SG_EXPORT Texture : public osg::StateAttribute
         /** Extensions class which encapsulates the querring of extensions and
           * associated function pointers, and provide convinience wrappers to 
           * check for the extensions or use the associated functions.*/        
-        class Extensions : public osg::Referenced
+        class SG_EXPORT Extensions : public osg::Referenced
         {
             public:
                 Extensions();
diff --git a/include/osg/Texture1D b/include/osg/Texture1D
index 3fd95696f..57687275a 100644
--- a/include/osg/Texture1D
+++ b/include/osg/Texture1D
@@ -65,7 +65,7 @@ class SG_EXPORT Texture1D : public Texture
         }
 
 
-        class SubloadCallback : public Referenced
+        class SG_EXPORT SubloadCallback : public Referenced
         {
             public:
                 virtual void load(const Texture1D& texture,State& state) const = 0;
diff --git a/include/osg/Texture2D b/include/osg/Texture2D
index a2a160f04..88d03e5b1 100644
--- a/include/osg/Texture2D
+++ b/include/osg/Texture2D
@@ -70,7 +70,7 @@ class SG_EXPORT Texture2D : public Texture
         }
 
 
-        class SubloadCallback : public Referenced
+        class SG_EXPORT SubloadCallback : public Referenced
         {
             public:
                 virtual void load(const Texture2D& texture,State& state) const = 0;
diff --git a/include/osg/Texture3D b/include/osg/Texture3D
index 51f410c8c..a5056379c 100644
--- a/include/osg/Texture3D
+++ b/include/osg/Texture3D
@@ -67,7 +67,7 @@ class SG_EXPORT Texture3D : public Texture
         }
 
 
-        class SubloadCallback : public Referenced
+        class SG_EXPORT SubloadCallback : public Referenced
         {
             public:
                 virtual void load(const Texture3D& texture,State& state) const = 0;
@@ -104,7 +104,7 @@ class SG_EXPORT Texture3D : public Texture
         /** Extensions class which encapsulates the querring of extensions and
           * associated function pointers, and provide convinience wrappers to 
           * check for the extensions or use the associated functions.*/        
-        class Extensions : public osg::Referenced
+        class SG_EXPORT Extensions : public osg::Referenced
         {
             public:
                 Extensions();
diff --git a/include/osg/TextureCubeMap b/include/osg/TextureCubeMap
index 61a389743..8fa5587b9 100644
--- a/include/osg/TextureCubeMap
+++ b/include/osg/TextureCubeMap
@@ -78,7 +78,7 @@ class SG_EXPORT TextureCubeMap : public Texture
         }
 
 
-        class SubloadCallback : public Referenced
+        class SG_EXPORT SubloadCallback : public Referenced
         {
             public:
                 virtual void load(const TextureCubeMap& texture,State& state) const = 0;
@@ -107,7 +107,7 @@ class SG_EXPORT TextureCubeMap : public Texture
         /** Extensions class which encapsulates the querring of extensions and
           * associated function pointers, and provide convinience wrappers to 
           * check for the extensions or use the associated functions.*/        
-        class Extensions : public osg::Referenced
+        class SG_EXPORT Extensions : public osg::Referenced
         {
             public:
                 Extensions();