diff --git a/nixos/modules/services/security/oauth2-proxy.nix b/nixos/modules/services/security/oauth2-proxy.nix
index a897f04ea633..38da06e1538a 100644
--- a/nixos/modules/services/security/oauth2-proxy.nix
+++ b/nixos/modules/services/security/oauth2-proxy.nix
@@ -62,7 +62,7 @@ let
   } // lib.optionalAttrs (cfg.passBasicAuth) {
     basic-auth-password = cfg.basicAuthPassword;
   } // lib.optionalAttrs (cfg.htpasswd.file != null) {
-    display-htpasswd-file = cfg.htpasswd.displayForm;
+    display-htpasswd-form = cfg.htpasswd.displayForm;
   } // lib.optionalAttrs tls.enable {
     tls-cert-file = tls.certificate;
     tls-key-file = tls.key;