diff --git a/src/yunohost/domain.py b/src/yunohost/domain.py
index 685e60517..dd2eda4a3 100644
--- a/src/yunohost/domain.py
+++ b/src/yunohost/domain.py
@@ -340,7 +340,7 @@ def _build_dns_conf(domain, ttl=3600):
             {"type": "TXT", "name": "_dmarc", "value": "\"v=DMARC1; p=none\"", "ttl": 3600}
         ],
         "extra": [
-            {"type": "CAA", "name": "@", "value": "128 issue 'letsencrypt.org", "ttl": 3600},
+            {"type": "CAA", "name": "@", "value": "128 issue 'letsencrypt.org'", "ttl": 3600},
         ],
     }
     """