diff --git a/cibuildwheel/linux.py b/cibuildwheel/linux.py
index 2ceaf8f1..33eacf87 100644
--- a/cibuildwheel/linux.py
+++ b/cibuildwheel/linux.py
@@ -6,10 +6,11 @@ import sys
 import textwrap
 import uuid
 
-from typing import Callable, List, NamedTuple, Optional, Union
+from typing import List, NamedTuple, Optional, Union
 
 from .util import (
     BuildOptions,
+    BuildSelector,
     get_build_verbosity_extra_flags,
     prepare_command,
 )
@@ -49,7 +50,7 @@ class PythonConfiguration(NamedTuple):
     path: str
 
 
-def get_python_configurations(build_selector: Callable[[str], bool]) -> List[PythonConfiguration]:
+def get_python_configurations(build_selector: BuildSelector) -> List[PythonConfiguration]:
     python_configurations = [
         PythonConfiguration(version='2.7', identifier='cp27-manylinux_x86_64', path='/opt/python/cp27-cp27m'),
         PythonConfiguration(version='2.7', identifier='cp27-manylinux_x86_64', path='/opt/python/cp27-cp27mu'),
diff --git a/cibuildwheel/macos.py b/cibuildwheel/macos.py
index e2b18b88..d877a8a8 100644
--- a/cibuildwheel/macos.py
+++ b/cibuildwheel/macos.py
@@ -6,11 +6,12 @@ import sys
 import tempfile
 from glob import glob
 
-from typing import Callable, Dict, List, Optional, NamedTuple, Union
+from typing import Dict, List, Optional, NamedTuple, Union
 
 from .environment import ParsedEnvironment
 from .util import (
     BuildOptions,
+    BuildSelector,
     download,
     get_build_verbosity_extra_flags,
     get_pip_script,
@@ -34,7 +35,7 @@ class PythonConfiguration(NamedTuple):
     url: str
 
 
-def get_python_configurations(build_selector: Callable[[str], bool]) -> List[PythonConfiguration]:
+def get_python_configurations(build_selector: BuildSelector) -> List[PythonConfiguration]:
     python_configurations = [
         # CPython
         PythonConfiguration(version='2.7', identifier='cp27-macosx_x86_64', url='https://www.python.org/ftp/python/2.7.18/python-2.7.18-macosx10.9.pkg'),
diff --git a/cibuildwheel/windows.py b/cibuildwheel/windows.py
index 89d01a6e..cd07bbcf 100644
--- a/cibuildwheel/windows.py
+++ b/cibuildwheel/windows.py
@@ -6,11 +6,12 @@ import tempfile
 from glob import glob
 from zipfile import ZipFile
 
-from typing import Callable, Dict, List, Optional, NamedTuple
+from typing import Dict, List, Optional, NamedTuple
 
 from .environment import ParsedEnvironment
 from .util import (
     BuildOptions,
+    BuildSelector,
     download,
     get_build_verbosity_extra_flags,
     get_pip_script,
@@ -41,7 +42,7 @@ class PythonConfiguration(NamedTuple):
     url: Optional[str]
 
 
-def get_python_configurations(build_selector: Callable[[str], bool]) -> List[PythonConfiguration]:
+def get_python_configurations(build_selector: BuildSelector) -> List[PythonConfiguration]:
     python_configurations = [
         # CPython
         PythonConfiguration(version='2.7.18', arch='32', identifier='cp27-win32', url=None),