diff --git a/charmcraft.yaml b/charmcraft.yaml
index c9a0ed7..ac932d0 100644
--- a/charmcraft.yaml
+++ b/charmcraft.yaml
@@ -25,6 +25,9 @@ bases:
         architectures:
           - amd64
     run-on:
+      - name: ubuntu
+        channel: "18.04"
+        architectures: [amd64, s390x, ppc64el, arm64]
       - name: ubuntu
         channel: "20.04"
         architectures: [amd64, s390x, ppc64el, arm64]