diff --git a/include/osgVolume/Property b/include/osgVolume/Property
index 44787ff5f..d24e990d1 100644
--- a/include/osgVolume/Property
+++ b/include/osgVolume/Property
@@ -379,7 +379,7 @@ class OSGVOLUME_EXPORT PropertyAdjustmentCallback : public osgGA::GUIEventHandle
 
         PropertyAdjustmentCallback();
 
-        PropertyAdjustmentCallback(const PropertyAdjustmentCallback&,const osg::CopyOp&) {}
+        PropertyAdjustmentCallback(const PropertyAdjustmentCallback&,const osg::CopyOp&);
 
         META_Object(osgVolume,PropertyAdjustmentCallback);