diff --git a/core/nginx/config.py b/core/nginx/config.py
index a9bce89b..1b0f7235 100755
--- a/core/nginx/config.py
+++ b/core/nginx/config.py
@@ -26,11 +26,11 @@ cert_name = os.getenv("TLS_CERT_FILENAME", default="cert.pem")
 keypair_name = os.getenv("TLS_KEYPAIR_FILENAME", default="key.pem")
 args["TLS"] = {
     "cert": ("/certs/%s" % cert_name, "/certs/%s" % keypair_name),
-    "letsencrypt": ("/certs/letsencrypt/live/mailu/fullchain.pem",
-        "/certs/letsencrypt/live/mailu/privkey.pem", "/certs/letsencrypt/live/mailu-ecdsa/fullchain.pem", "/certs/letsencrypt/live/mailu-ecdsa/privkey.pem"),
+    "letsencrypt": ("/certs/letsencrypt/live/mailu/chain.pem",
+        "/certs/letsencrypt/live/mailu/privkey.pem", "/certs/letsencrypt/live/mailu-ecdsa/chain.pem", "/certs/letsencrypt/live/mailu-ecdsa/privkey.pem"),
     "mail": ("/certs/%s" % cert_name, "/certs/%s" % keypair_name),
-    "mail-letsencrypt": ("/certs/letsencrypt/live/mailu/fullchain.pem",
-        "/certs/letsencrypt/live/mailu/privkey.pem", "/certs/letsencrypt/live/mailu-ecdsa/fullchain.pem", "/certs/letsencrypt/live/mailu-ecdsa/privkey.pem"),
+    "mail-letsencrypt": ("/certs/letsencrypt/live/mailu/chain.pem",
+        "/certs/letsencrypt/live/mailu/privkey.pem", "/certs/letsencrypt/live/mailu-ecdsa/chain.pem", "/certs/letsencrypt/live/mailu-ecdsa/privkey.pem"),
     "notls": None
 }[args["TLS_FLAVOR"]]