diff --git a/modules/secrets/secrets.nix b/modules/secrets/secrets.nix
index 3737509..8ee9892 100644
--- a/modules/secrets/secrets.nix
+++ b/modules/secrets/secrets.nix
@@ -20,7 +20,10 @@ in
 
   "lohr/secret.age".publicKeys = all;
 
-  "matrix/mail.age".publicKeys = all;
+  "matrix/mail.age" = {
+    owner = "matrix-synapse";
+    publicKeys = all;
+  };
   "matrix/secret.age".publicKeys = all;
 
   "miniflux/credentials.age".publicKeys = all;