diff --git a/include/osgDB/Options b/include/osgDB/Options
index 5882a1e94..a216cf8c4 100644
--- a/include/osgDB/Options
+++ b/include/osgDB/Options
@@ -114,7 +114,7 @@ class OSGDB_EXPORT Options : public osg::Object
 
         META_Object(osgDB,Options);
 
-        Options* cloneOptions() const { return static_cast<Options*>(clone(osg::CopyOp::SHALLOW_COPY)); }
+        Options* cloneOptions(const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY) const { return static_cast<Options*>(clone(copyop)); }
 
         /** Set the general Options string.*/
         void setOptionString(const std::string& str) { _str = str; parsePluginStringData(str); }