diff --git a/nixos/modules/services/continuous-integration/github-runner/options.nix b/nixos/modules/services/continuous-integration/github-runner/options.nix
index 82517caccc41..9c11b7f9172d 100644
--- a/nixos/modules/services/continuous-integration/github-runner/options.nix
+++ b/nixos/modules/services/continuous-integration/github-runner/options.nix
@@ -152,7 +152,7 @@ with lib;
   };
 
   user = mkOption {
-    type = types.string;
+    type = types.str;
     description = ''
       User under which to run the service. If null, will use a systemd dynamic user.
     '';