diff --git a/include/osg/NodeVisitor b/include/osg/NodeVisitor
index db6d27747..d1decdabf 100644
--- a/include/osg/NodeVisitor
+++ b/include/osg/NodeVisitor
@@ -357,7 +357,7 @@ class NodeAcceptOp
 
     protected:
 
-        NodeAcceptOp& operator = (const NodeVisitor&) { return *this; }
+        NodeAcceptOp& operator = (const NodeAcceptOp&) { return *this; }
 
         NodeVisitor& _nv;
 };