diff --git a/nixos/modules/services/networking/tinyproxy.nix b/nixos/modules/services/networking/tinyproxy.nix
index 5712f7949ef0..98bb0ad9587b 100644
--- a/nixos/modules/services/networking/tinyproxy.nix
+++ b/nixos/modules/services/networking/tinyproxy.nix
@@ -63,7 +63,7 @@ in
             freeformType = settingsFormat.type;
             options = {
               Listen = mkOption {
-                type = types.str;
+                type = types.nullOr types.str;
                 default = "127.0.0.1";
                 description = ''
                   Specify which address to listen to.