diff --git a/tasks/main.yml b/tasks/main.yml
index 4244b67..91bd2cf 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -7,14 +7,14 @@
   when:
    - ansible_distribution != 'Fedora'
    - ansible_distribution != 'Archlinux'
-   - ansible_distribution != 'Centos'
+   - ansible_distribution != 'CentOS'
 
 - name: register os-specific variables
-  include_vars: "{{ ansible_distribution }}.yml"
+  include_vars: "{{ ansible_distribution | lower }}.yml"
   when:
    - ansible_distribution == 'Fedora'
    - ansible_distribution == 'Archlinux'
-   - ansible_distribution == 'Centos'
+   - ansible_distribution == 'CentOS'
 
 - name: Collect all users and groups allowed to login via ssh
   set_fact:
diff --git a/vars/Archlinux.yml b/vars/archlinux.yml
similarity index 100%
rename from vars/Archlinux.yml
rename to vars/archlinux.yml
diff --git a/vars/CentOS.yml b/vars/centos.yml
similarity index 100%
rename from vars/CentOS.yml
rename to vars/centos.yml
diff --git a/vars/Fedora.yml b/vars/fedora.yml
similarity index 100%
rename from vars/Fedora.yml
rename to vars/fedora.yml
diff --git a/vars/main.yml b/vars/main.yml
index 5952bf5..9eaf1a6 100644
--- a/vars/main.yml
+++ b/vars/main.yml
@@ -1,3 +1,3 @@
 ---
-playbook_version_number: 118
+playbook_version_number: 119
 playbook_version_path: '/etc/ansible-version/role-sshd_chaos-bodensee_github.com.version'