diff --git a/tasks/validate/main.yml b/tasks/validate/main.yml
index b6bfc9f..1ee2a09 100644
--- a/tasks/validate/main.yml
+++ b/tasks/validate/main.yml
@@ -1,13 +1,13 @@
 ---
 
 - include_tasks: environment/remote/packages.yml
-  loop: "{{ k3s_check_packages[ansible_distribution | replace(' ', '-') | lower] }}"
+  loop: "{{ k3s_check_packages[k3s_os_distribution_version] }}"
   loop_control:
     loop_var: package
   when:
     - not k3s_skip_validation
     - not k3s_skip_env_checks
-    - k3s_check_packages[ansible_distribution | replace(' ', '-') | lower] is defined
+    - k3s_check_packages[k3s_os_distribution_version] is defined
 
 - import_tasks: configuration/variables.yml
 
diff --git a/vars/main.yml b/vars/main.yml
index 13fcec2..57a13ae 100644
--- a/vars/main.yml
+++ b/vars/main.yml
@@ -88,12 +88,17 @@ k3s_server_manifests_dir: "{{ k3s_data_dir }}/server/manifests"
 # https://github.com/k3s-io/k3s/pull/1691
 k3s_server_pod_manifests_dir: "{{ k3s_data_dir }}/agent/pod-manifests"
 
+# OS formatted strings
+k3s_os_distribution: "{{ ansible_distribution | replace(' ', '-') | lower }}"
+k3s_os_version: "{{ ansible_distribution_version | replace([' ', '.'], '-') | lower }}"
+k3s_os_distribution_version: "{{ k3s_os_distribution }}-{{ k3s_os_version }}"
+
 # Packages that we need to check are installed
 k3s_check_packages:
-  debian:
-    - name: iptables
+  debian-11:
+    - name: iptables-legacy
       from: 1.19.2
-      until: 1.22.2
+      # until: 1.22.2
       documentation: https://rancher.com/docs/k3s/latest/en/advanced/#enabling-legacy-iptables-on-raspbian-buster
 # - name: dummy
 #   from: 1.19.2