diff --git a/roles/common/templates/tarsnap_sources.list.j2 b/roles/common/templates/tarsnap_sources.list.j2
index b9dc0ec..b1dc68b 100644
--- a/roles/common/templates/tarsnap_sources.list.j2
+++ b/roles/common/templates/tarsnap_sources.list.j2
@@ -1,6 +1 @@
-{% if ansible_distribution_version is version_compare('18.04', '==') %}
-# 2018-03-17: no Ubuntu 18.04 "bionic" packages yet, so use 17.10 "artful"
-deb https://pkg.tarsnap.com/deb/artful ./
-{% else %}
-deb https://pkg.tarsnap.com/deb/{{ ansible_distribution_release }} ./
-{% endif %}
+deb [arch=amd64] https://pkg.tarsnap.com/deb/{{ ansible_distribution_release }} ./