diff --git a/src/osgPlugins/osgjs/Animation b/src/osgPlugins/osgjs/Animation
index 92a1e2891..366de2b5d 100644
--- a/src/osgPlugins/osgjs/Animation
+++ b/src/osgPlugins/osgjs/Animation
@@ -6,7 +6,7 @@
 #include <osgAnimation/Animation>
 #include <osgAnimation/UpdateMatrixTransform>
 
-struct WriteVisitor;
+class WriteVisitor;
 
 JSONObject* createJSONAnimation(osgAnimation::Animation* anim, WriteVisitor* writer);
 JSONObject* createJSONUpdateMatrixTransform(osgAnimation::UpdateMatrixTransform& acb, WriteVisitor* writer);