diff --git a/tcltk/netgen.sh.in b/tcltk/netgen.sh.in
index 59aa4ae..215330a 100755
--- a/tcltk/netgen.sh.in
+++ b/tcltk/netgen.sh.in
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 #
 # For installation, put this file (netgen.sh) in a standard executable path.
 # Put startup script "netgen.tcl" and shared library "tclnetgen.so"