diff --git a/docs/tutorials/aws-sd.md b/docs/tutorials/aws-sd.md
index 5f0eb76c19..9741b5f9d4 100644
--- a/docs/tutorials/aws-sd.md
+++ b/docs/tutorials/aws-sd.md
@@ -221,7 +221,7 @@ metadata:
   name: nginx
   annotations:
     external-dns.alpha.kubernetes.io/hostname: nginx.external-dns-test.my-org.com
-    external-dns.alpha.kubernetes.io/ttl: 60
+    external-dns.alpha.kubernetes.io/ttl: "60"
 spec:
     ...
 ```