diff --git a/docs/roundcube.nix b/docs/roundcube.nix
index 4666f1f..52cf5b0 100644
--- a/docs/roundcube.nix
+++ b/docs/roundcube.nix
@@ -23,9 +23,7 @@
       # https://search.nixos.org/packages?query=aspellDicts
       en
     ];
-    # Account for ~30% size increase due to base64 encoding of attachments
-    # https://github.com/roundcube/roundcubemail/issues/7979
-    maxAttachmentSize = config.mailserver.messageSizeLimit / 1024 / 1024 / 1.37;
+    maxAttachmentSize = config.mailserver.messageSizeLimit / 1024 / 1024;
     extraConfig = ''
       $config['imap_host'] = "ssl://${config.mailserver.fqdn}";
       $config['smtp_host'] = "ssl://${config.mailserver.fqdn}";