diff --git a/nixos/tests/trac.nix b/nixos/tests/trac.nix
index 7953f8d41f7..af7182d1e18 100644
--- a/nixos/tests/trac.nix
+++ b/nixos/tests/trac.nix
@@ -14,6 +14,6 @@ import ./make-test-python.nix ({ pkgs, ... }: {
     start_all()
     machine.wait_for_unit("trac.service")
     machine.wait_for_open_port(8000)
-    machine.wait_until_succeeds("curl -L http://localhost:8000/ | grep 'Trac Powered'")
+    machine.wait_until_succeeds("curl -fL http://localhost:8000/ | grep 'Trac Powered'")
   '';
 })