diff --git a/regen b/regen
index 0d894688cc..b5ec049779 100755
--- a/regen
+++ b/regen
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/ksh
 #
 # regenerates the file given as command line argument by running config.status
 # (the file is supposed to be generated by configure script)