diff --git a/debian/changelog b/debian/changelog
index f79b493..a6ed89e 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+ubuntu-dev-tools (0.164) unstable; urgency=medium
+
+  * mk-sbuild: Initialise ubuntu_dist_ge vars so unknown releases work.
+
+ -- Adam Conrad <adconrad@ubuntu.com>  Tue, 24 Apr 2018 05:24:43 -0600
+
 ubuntu-dev-tools (0.163) unstable; urgency=medium
 
   * mk-sbuild: Add ubuntu_dist_ge and use it to set BUILD_PKGS for Ubuntu.
diff --git a/mk-sbuild b/mk-sbuild
index 1d3110b..516c187 100755
--- a/mk-sbuild
+++ b/mk-sbuild
@@ -333,6 +333,8 @@ fi
 if [ "$DISTRO" = "ubuntu" ]; then
     ubuntu_dist_ge() {
       local releases="$(ubuntu-distro-info --all)"
+      local left=999
+      local right=0
       local seq=1
       for i in $releases; do
         if [ $1 = $i ]; then