diff --git a/debian/changelog b/debian/changelog
index 07343311..4462e223 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -8,6 +8,8 @@ livecd-rootfs (0.99) UNRELEASED; urgency=low
   * Rename EXTRASOURCE to PPA and also define PPAMIRROR near top, set to
     ppa.launchpad.net.  Changing to PPA avoids listing non-main components in
     deb lines and having an useful comment in sources.list.
+  * Create an etc/apt/preferences file Pin-ing the PPA at 550 when there's
+    one.
 
  -- Loïc Minier <loic.minier@ubuntu.com>  Thu, 24 Sep 2009 11:52:25 +0200
 
diff --git a/livecd.sh b/livecd.sh
index ebd2936f..91230b6f 100755
--- a/livecd.sh
+++ b/livecd.sh
@@ -382,6 +382,13 @@ Pin-Priority: 900
     fi
     if [ -n "$PPA" ]; then
         echo deb http://$PPAMIRROR/$PPA/ubuntu ${STE} main >> ${ROOT}etc/apt/sources.list
+
+        touch ${ROOT}etc/apt/preferences
+        cat << @@EOF >> ${ROOT}etc/apt/preferences
+Package: *
+Pin: release o=LP-PPA-${PPA/\//-}
+Pin-Priority: 550
+@@EOF
     fi
     chroot $ROOT apt-get update
     if [ "$FS" = "ubuntu-moblin-remix" ]; then
@@ -499,6 +506,13 @@ ${COMMENT}deb-src ${SECSRCMIRROR} ${STE}-security multiverse
 ## to create the base image of this system
 deb http://$PPAMIRROR/$PPA/ubuntu ${STE} main
 deb-src http://$PPAMIRROR/$PPA/ubuntu ${STE} main
+@@EOF
+
+        touch ${ROOT}etc/apt/preferences
+        cat << @@EOF >> ${ROOT}etc/apt/preferences
+Package: *
+Pin: release o=LP-PPA-${PPA/\//-}
+Pin-Priority: 550
 @@EOF
     fi
     mv ${ROOT}etc/apt/trusted.gpg.$$ ${ROOT}etc/apt/trusted.gpg