diff --git a/debian/changelog b/debian/changelog
index f829a3d4..54f7387c 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,10 +1,16 @@
 livecd-rootfs (2.36) UNRELEASED; urgency=low
 
+  [ Colin Watson ]
   * BuildLiveCD: Add subproject and ubuntu-defaults-image locale to error
     mail subject.
   * BuildLiveCD: Install recommendations of ubuntu-defaults-builder.
 
- -- Colin Watson <cjwatson@ubuntu.com>  Wed, 31 Aug 2011 10:02:05 +0100
+  [ Oliver Grawert ]
+  * also store the size of the ac100 tarball in the initrd, since the tarball 
+    changes its name several times during build we need a second criteria to not
+    loop over all availiable tarballs with md5sum at install time.
+
+ -- Oliver Grawert <ogra@ubuntu.com>  Tue, 06 Sep 2011 15:18:52 +0200
 
 livecd-rootfs (2.35) oneiric; urgency=low
 
diff --git a/live-build/auto/build b/live-build/auto/build
index 061f979a..fd95b4b2 100755
--- a/live-build/auto/build
+++ b/live-build/auto/build
@@ -184,8 +184,9 @@ if [ "$NUMFLAVOURS" = 1 ] && [ "$LB_LINUX_FLAVOURS" != "none" ]; then
 fi
 
 if [ "$SUBARCH" = "ac100" ]; then
-	# create the md5sum file for which we are actually doing all this
+	# create the md5sum and size files for which we are actually doing all this
 	md5sum $PREFIX.rootfs.tar.gz >chroot/installer.md5
+	wc -c $PREFIX.rootfs.tar.gz >chroot/installer.size
 
 	# make sure update-initramfs feels cosy and warm in the environment
 	lb chroot_proc install "$@"