diff --git a/deployments/ssl/certmanager.yaml b/deployments/ssl/certmanager.yaml
index 2daccc3..80bf613 100644
--- a/deployments/ssl/certmanager.yaml
+++ b/deployments/ssl/certmanager.yaml
@@ -44,7 +44,7 @@ spec:
         rfc2136:
           nameserver: hawke.hxst.com.au:53
           tsigKeyName: "hxme-update-key"
-          tsigAlgorithm: "hmac-sha512"
+          tsigAlgorithm: HMACSHA512
           tsigSecretSecretRef:
             name: hxme-update-key
             key:  hxme-update-key