diff --git a/debian/alternc.postinst b/debian/alternc.postinst
index cc8f1ff8..72c90641 100644
--- a/debian/alternc.postinst
+++ b/debian/alternc.postinst
@@ -68,7 +68,7 @@ case "$1" in
     # build local.sh if it does not exist
     if [ ! -f $CONFIGFILE ]; then
         cat > $CONFIGFILE <<EOF
-#!/bin/sh
+#!/bin/bash
 #
 # AlternC - Web Hosting System - Configuration
 # This file will be modified on package configuration
diff --git a/install/dopo.sh b/install/dopo.sh
index 3aea0c5c..236f1626 100755
--- a/install/dopo.sh
+++ b/install/dopo.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 #### THIS SCRIPT IS NO LONGER USED
 #### AND HAVE NO EFFECT!
diff --git a/install/mysql.sh b/install/mysql.sh
index 3b9f9a19..c8506277 100755
--- a/install/mysql.sh
+++ b/install/mysql.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 #
 # $Id: mysql.sh,v 1.11 2006/01/11 22:51:28 anarcat Exp $
 # ----------------------------------------------------------------------
diff --git a/install/upgrade_check.sh b/install/upgrade_check.sh
index e387f028..88502e2d 100755
--- a/install/upgrade_check.sh
+++ b/install/upgrade_check.sh
@@ -72,7 +72,7 @@ for file in $( ls $extensions | sort -n ) ; do
 		  	  php -q $file
 			  ;;
 		      sh)
-		  	  sh $file
+		  	  bash $file
 			  ;;
                       *)
 			  echo "skipping $file, not recognized !"
diff --git a/install/upgrades/0.9.5.sh b/install/upgrades/0.9.5.sh
index 0e9b2453..2ed7d283 100755
--- a/install/upgrades/0.9.5.sh
+++ b/install/upgrades/0.9.5.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 set -e
 
diff --git a/install/upgrades/3.0.0~2.sh b/install/upgrades/3.0.0~2.sh
index 8a654405..643f4b42 100644
--- a/install/upgrades/3.0.0~2.sh
+++ b/install/upgrades/3.0.0~2.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # Upgrading script to AlternC 1.1
 
 CONFIG_FILE="/etc/alternc/local.sh"
diff --git a/nightlybuild/build.sh b/nightlybuild/build.sh
index 1e7bc90d..8d5a3c55 100755
--- a/nightlybuild/build.sh
+++ b/nightlybuild/build.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 VERSION="1.0"
 # We launch this script inside the home directory of the "nigthly build user"
diff --git a/phpunit/local.sh_generic b/phpunit/local.sh_generic
index c0d9c39d..bbe93f14 100755
--- a/phpunit/local.sh_generic
+++ b/phpunit/local.sh_generic
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 #
 # AlternC - Web Hosting System - Configuration
 # This file will be modified on package configuration
diff --git a/upnp/upnp-install b/upnp/upnp-install
index 13f47935..05a7907c 100644
--- a/upnp/upnp-install
+++ b/upnp/upnp-install
@@ -1,2 +1,2 @@
-#!/bin/sh
+#!/bin/bash