diff --git a/modules/nixos/roundcube.nix b/modules/nixos/roundcube.nix
index 0749af5..f076ece 100644
--- a/modules/nixos/roundcube.nix
+++ b/modules/nixos/roundcube.nix
@@ -9,4 +9,8 @@
       $config['smtp_pass'] = "%p";
     '';
   };
+  environment.persistence."/persist".directories = [
+    "/var/lib/roundcube"
+    "/var/lib/postgresql"
+  ];
 }