diff --git a/cibuildwheel/util.py b/cibuildwheel/util.py
index d0602fdaa..265d3747b 100644
--- a/cibuildwheel/util.py
+++ b/cibuildwheel/util.py
@@ -45,7 +45,7 @@
 
 install_certifi_script: Final = resources_dir / "install_certifi.py"
 
-BuildFrontend: Final = Literal["pip", "build"]
+BuildFrontend = Literal["pip", "build"]
 
 MANYLINUX_ARCHS: Final = (
     "x86_64",