diff --git a/examples/osganimationtimeline/osganimationtimeline.cpp b/examples/osganimationtimeline/osganimationtimeline.cpp
index 4885e7b06..17f87b2ad 100644
--- a/examples/osganimationtimeline/osganimationtimeline.cpp
+++ b/examples/osganimationtimeline/osganimationtimeline.cpp
@@ -38,7 +38,7 @@
 
 struct NoseBegin : public osgAnimation::Action::Callback
 {
-    virtual void operator()(osgAnimation::Action* action, osgAnimation::ActionVisitor* nv)
+    virtual void operator()(osgAnimation::Action* action, osgAnimation::ActionVisitor* /*nv*/)
     {
         std::cout << "sacrebleu, it scratches my nose, let me scratch it" << std::endl;
         std::cout << "process NoseBegin call back " << action->getName() << std::endl << std::endl;
@@ -47,7 +47,7 @@ struct NoseBegin : public osgAnimation::Action::Callback
 
 struct NoseEnd : public osgAnimation::Action::Callback
 {
-    virtual void operator()(osgAnimation::Action* action, osgAnimation::ActionVisitor* nv)
+    virtual void operator()(osgAnimation::Action* action, osgAnimation::ActionVisitor* /*nv*/)
     {
         std::cout << "shhhrt shrrrrt shhhhhhrrrrt, haaa it's better"<< std::endl;
         std::cout << "process NoseEnd call back " << action->getName() << std::endl << std::endl;