diff --git a/nixos/modules/services/misc/rippled.nix b/nixos/modules/services/misc/rippled.nix
index ef34e3a779f..2fce3b9dc94 100644
--- a/nixos/modules/services/misc/rippled.nix
+++ b/nixos/modules/services/misc/rippled.nix
@@ -389,6 +389,7 @@ in
 
       extraConfig = mkOption {
         default = "";
+        type = types.lines;
         description = ''
           Extra lines to be added verbatim to the rippled.cfg configuration file.
         '';