diff --git a/nixos/common/modules/yubikey-auth.nix b/nixos/common/modules/yubikey-auth.nix
index 45da7372..0e14ec02 100644
--- a/nixos/common/modules/yubikey-auth.nix
+++ b/nixos/common/modules/yubikey-auth.nix
@@ -4,7 +4,7 @@
     debug = true;
     control = "required";
     mode = "challenge-response";
-    challengeResponsePath = /run/secrets/yubikey;
+    challengeResponsePath = "/run/secrets/yubikey";
     id = [ "18550256" ];
   };