diff --git a/include/osg/Vec2f b/include/osg/Vec2f
index 6fee4a331..35d82dae3 100644
--- a/include/osg/Vec2f
+++ b/include/osg/Vec2f
@@ -59,6 +59,7 @@ class Vec2f
         inline const value_type * ptr() const { return _v; }
 
         inline void set( value_type x, value_type y ) { _v[0]=x; _v[1]=y; }
+        inline void set( const Vec2f& rhs) { _v[0]=rhs._v[0]; _v[1]=rhs._v[1]; }
 
         inline value_type & operator [] (int i) { return _v[i]; }
         inline value_type operator [] (int i) const { return _v[i]; }