diff --git a/nixos/modules/services/logging/graylog.nix b/nixos/modules/services/logging/graylog.nix
index ee5668254981..c8c4a9ff06db 100644
--- a/nixos/modules/services/logging/graylog.nix
+++ b/nixos/modules/services/logging/graylog.nix
@@ -108,7 +108,7 @@ in
       };
 
       extraConfig = mkOption {
-        type = types.str;
+        type = types.lines;
         default = "";
         description = "Any other configuration options you might want to add";
       };