diff --git a/src/osgEarthSymbology/Resource b/src/osgEarthSymbology/Resource
index a8a1441..934fc7d 100644
--- a/src/osgEarthSymbology/Resource
+++ b/src/osgEarthSymbology/Resource
@@ -33,7 +33,7 @@ namespace osgEarth { namespace Symbology
     class OSGEARTHSYMBOLOGY_EXPORT Resource : public Taggable<osg::Object>
     {
     protected:
-        Resource(const Resource& rhs,const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY) {};
+        Resource(const Resource& rhs,const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY) : Taggable() {};
         Resource( const Config& config =Config() );
 
         /** dtor */