diff --git a/extensions/molecule/default/molecule.yml b/extensions/molecule/default/molecule.yml
index 9d1e7a9..b657f8a 100644
--- a/extensions/molecule/default/molecule.yml
+++ b/extensions/molecule/default/molecule.yml
@@ -9,7 +9,7 @@ driver:
       ansible_connection: docker
 platforms:
   - name: instance
-    image: geerlingguy/docker-${MOLECULE_DISTRO:~rockylinux9}-ansible:latest
+    image: geerlingguy/docker-${MOLECULE_DISTRO:-rockylinux9}-ansible:latest
     command: "/sbin/init"
     volumes:
       - /sys/fs/cgroup:/sys/fs/cgroup:ro