diff --git a/include/osg/TriangleLinePointIndexFunctor b/include/osg/TriangleLinePointIndexFunctor
index 877e2a6ee..96d38e062 100644
--- a/include/osg/TriangleLinePointIndexFunctor
+++ b/include/osg/TriangleLinePointIndexFunctor
@@ -16,6 +16,7 @@
 #include <osg/PrimitiveSet>
 #include <osg/Array>
 
+namespace osg {
 
 template<class T>
 class TriangleLinePointIndexFunctor : public osg::PrimitiveIndexFunctor, public T
@@ -254,4 +255,6 @@ public:
     std::vector<unsigned int> _remap;
 };
 
+}
+
 #endif