diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4e62fa5..5c49051 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -45,7 +45,7 @@ jobs:
           - rockylinux8
           - ubuntu2204
           - ubuntu2004
-          # - debian12  # Having weird idempotence issue.
+          - debian12
           - debian11
 
     steps:
diff --git a/tasks/main.yml b/tasks/main.yml
index 6af64f6..a6de3d5 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -2,7 +2,7 @@
 - name: Include OS-specific variables.
   include_vars: "{{ item }}"
   with_first_found:
-    - "{{ ansible_facts['os_family'] + '_' + ansible_facts['distribution_major_version'] }}.yml"
+    - "{{ ansible_facts['os_family'] + '-' + ansible_facts['distribution_major_version'] }}.yml"
     - "{{ ansible_facts['os_family'] }}.yml"
 
 - name: Set the ntp_driftfile variable.
diff --git a/vars/Debian_12.yml b/vars/Debian-12.yml
similarity index 100%
rename from vars/Debian_12.yml
rename to vars/Debian-12.yml