diff --git a/pkgs/development/python-modules/pytest-httpbin/default.nix b/pkgs/development/python-modules/pytest-httpbin/default.nix
index 0069eb6f179e..7dc70c49280f 100644
--- a/pkgs/development/python-modules/pytest-httpbin/default.nix
+++ b/pkgs/development/python-modules/pytest-httpbin/default.nix
@@ -28,6 +28,12 @@ buildPythonPackage rec {
     six
   ];
 
+  preCheck = ''
+    # Remove assertion that doesn't hold for Flask 2.1.0
+    substituteInPlace tests/test_server.py \
+      --replace "assert response.headers['Location'].startswith('https://')" ""
+  '';
+
   checkInputs = [
     pytestCheckHook
     requests