diff --git a/include/osgUtil/IncrementalCompileOperation b/include/osgUtil/IncrementalCompileOperation
index 76f51dbb8..9a753b7e0 100644
--- a/include/osgUtil/IncrementalCompileOperation
+++ b/include/osgUtil/IncrementalCompileOperation
@@ -24,7 +24,7 @@ class OSGUTIL_EXPORT StateToCompile : public osg::NodeVisitor
 {
     public:
 
-        StateToCompile(GLObjectsVisitor::Mode mode, osg::Object* markerObject);
+        StateToCompile(GLObjectsVisitor::Mode mode, osg::Object* markerObject=0);
 
         typedef std::set<osg::Drawable*> DrawableSet;
         typedef std::set<osg::StateSet*> StateSetSet;
@@ -266,7 +266,7 @@ class OSGUTIL_EXPORT IncrementalCompileOperation : public osg::GraphicsOperation
             typedef std::map<osg::GraphicsContext*, CompileList >  CompileMap;
             CompileMap                              _compileMap;
 
-            osg::ref_ptr<osg::Object>           _markerObject;
+            osg::ref_ptr<osg::Object>               _markerObject;
 
         protected: