diff --git a/debian/changelog b/debian/changelog
index b6f1dbb7..ec4f5907 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+livecd-rootfs (1.137) UNRELEASED; urgency=low
+
+  * Make sure APT_SOURCE is always set.
+
+ -- Colin Watson <cjwatson@ubuntu.com>  Wed, 21 Jul 2010 07:52:14 +0100
+
 livecd-rootfs (1.136) maverick; urgency=low
  
   * One more fix; if we're asking apt to downgrade packages, we have to
diff --git a/livecd.sh b/livecd.sh
index ee8a2175..04f020f1 100755
--- a/livecd.sh
+++ b/livecd.sh
@@ -154,6 +154,7 @@ IMAGEFORMAT="squashfs"
 # must be in the "team / PPA name" form; e.g. "moblin/ppa"; the default PPA
 # name is "ppa", don't omit it
 PPA=""
+APT_SOURCE=""
 
 while getopts :d:e:i:I:m:S:s:a:A:f:p name; do case $name in
     d)  STE=$OPTARG;;