diff --git a/configure1.in b/configure1.in
index 65159c0a68a..c64177799b2 100755
--- a/configure1.in
+++ b/configure1.in
@@ -1,4 +1,7 @@
-#!/bin/sh
+
+### The above line is deliberately left blank.  If it starts with a #,
+### some CSH's will think this is a csh script.
+
 #### Configuration script for GNU Emacs
 #### Copyright (C) 1992 Free Software Foundation, Inc.