diff --git a/tasks/section_2/cis_2.1.x.yml b/tasks/section_2/cis_2.1.x.yml
index 0a3ef25..411eccf 100644
--- a/tasks/section_2/cis_2.1.x.yml
+++ b/tasks/section_2/cis_2.1.x.yml
@@ -672,7 +672,7 @@
     - rule_2.1.21
     - NIST800-53R5_CM-7
   vars:
-    warn_control_id: '2.2.21'
+    warn_control_id: '2.1.21'
   block:
     - name: "2.1.21 | PATCH | Ensure mail transfer agents are configured for local-only mode | Make changes if exim4 installed"
       when: "'exim4' in ansible_facts.packages"