diff --git a/auxprogs/change-copyright-year b/auxprogs/change-copyright-year
index 9eb6e023f..27b3db937 100755
--- a/auxprogs/change-copyright-year
+++ b/auxprogs/change-copyright-year
@@ -17,9 +17,9 @@
 
 # The find command deliberately skips .svn/ subdirs -- we don't want to
 # change them.
-for i in `find . -name '*' -type f -not -path '*.svn\/*'` ; do
+for i in `find . -name '*.[chS]' -type f -not -path '*.svn\/*'` ; do
     echo $i
-    sed "s/Copyright (C) 200\([0-9]\)-2004/Copyright (C) 200\1-2005/" < $i > tmp.$$
+    sed "s/Copyright (C) 200\([0-9]\)-2005/Copyright (C) 200\1-2006/" < $i > tmp.$$
     mv tmp.$$ $i
 done