diff --git a/build-aux/pre-inst-env.in b/build-aux/pre-inst-env.in
index 2aee71f..8e14011 100644
--- a/build-aux/pre-inst-env.in
+++ b/build-aux/pre-inst-env.in
@@ -1,4 +1,4 @@
-#/bin/sh
+#!/bin/sh
 
 abs_top_srcdir="`cd "@abs_top_srcdir@" > /dev/null; pwd -P`"
 abs_top_builddir="`cd "@abs_top_builddir@" > /dev/null; pwd -P`"