diff --git a/examples/osgtext3D/osgtext3D.cpp b/examples/osgtext3D/osgtext3D.cpp
index 7495064e4..64c2c086b 100644
--- a/examples/osgtext3D/osgtext3D.cpp
+++ b/examples/osgtext3D/osgtext3D.cpp
@@ -43,7 +43,7 @@ public:
     {
     }
 
-    virtual bool handle(const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& aa)
+    virtual bool handle(const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter&)
     {
         if (ea.getEventType() == osgGA::GUIEventAdapter::KEYUP)
         {