diff --git a/system/helix-texta.nix b/system/helix-texta.nix
index 061d997..ef32a81 100644
--- a/system/helix-texta.nix
+++ b/system/helix-texta.nix
@@ -5,7 +5,7 @@ let
     # Account management.
     account required pam_unix.so
     # Authentication management.
-    auth required /nix/store/nyqhrbwgisnfj99m5v384czf7rqs67kw-yubico-pam-unstable-2019-07-01/lib/security/pam_yubico.so mode=challenge-response  
+    auth sufficient /nix/store/nyqhrbwgisnfj99m5v384czf7rqs67kw-yubico-pam-unstable-2019-07-01/lib/security/pam_yubico.so mode=challenge-response  
     auth sufficient /nix/store/fh3nczz4raw0ivnys933w0q8jqvxq4j3-fprintd-1.90.9/lib/security/pam_fprintd.so
     auth sufficient pam_unix.so nullok  likeauth try_first_pass
     auth required pam_deny.so