diff --git a/Packages/Interval_arithmetic/include/CGAL/Interval_arithmetic.h b/Packages/Interval_arithmetic/include/CGAL/Interval_arithmetic.h
index c99f7fe6a13..fdcda15b651 100644
--- a/Packages/Interval_arithmetic/include/CGAL/Interval_arithmetic.h
+++ b/Packages/Interval_arithmetic/include/CGAL/Interval_arithmetic.h
@@ -11,7 +11,7 @@
 // release       :
 // release_date  :
 //
-// file          : $Id$
+// file          : $Source$
 // revision      : $Revision$
 // revision_date : $Date$
 // package       : Interval Arithmetic