diff --git a/examples/osgterrain/osgterrain.cpp b/examples/osgterrain/osgterrain.cpp
index ce2bd11cc..ba6817688 100644
--- a/examples/osgterrain/osgterrain.cpp
+++ b/examples/osgterrain/osgterrain.cpp
@@ -85,7 +85,7 @@ public:
         _terrain(terrain),
         _mtc(mtc) {}
 
-    bool handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter& aa)
+    bool handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter& /*aa*/)
     {
         switch(ea.getEventType())
         {