diff --git a/runner/config.yaml b/runner/config.yaml
index eb2cc57..18e191b 100644
--- a/runner/config.yaml
+++ b/runner/config.yaml
@@ -29,7 +29,8 @@ container:
   # containers. The regex matches the full `source:target[:opts]`
   # string, so a permissive prefix is enough.
   valid_volumes:
-    - "^cargoxx-cache-(store|keys)$"
+    - "cargoxx-cache-store"
+    - "cargoxx-cache-keys"
   docker_host: "unix:///var/run/docker.sock"
   force_pull: false