diff --git a/deployments/ssl/certmanager.yaml b/deployments/ssl/certmanager.yaml
index efd0e56..9ab919c 100644
--- a/deployments/ssl/certmanager.yaml
+++ b/deployments/ssl/certmanager.yaml
@@ -47,7 +47,7 @@ spec:
             name: hawke-tsig
             key: tsig-secret
           tsigAlgorithm: HMACSHA256
-          tsigKeyName: externaldns-key
+          tsigKeyName: externaldns-key.
 ---
 apiVersion: cert-manager.io/v1
 kind: Certificate