diff --git a/mesonpy/_tags.py b/mesonpy/_tags.py
index 9bb93bad..00c86100 100644
--- a/mesonpy/_tags.py
+++ b/mesonpy/_tags.py
@@ -9,11 +9,6 @@
 import struct
 import sys
 import sysconfig
-import typing
-
-
-if typing.TYPE_CHECKING:  # pragma: no cover
-    from typing import Optional, Union
 
 
 # https://peps.python.org/pep-0425/#python-tag
@@ -36,13 +31,6 @@ def get_interpreter_tag() -> str:
     return f'{name}{version[0]}{version[1]}'
 
 
-def _get_config_var(name: str, default: Union[str, int, None] = None) -> Union[str, int, None]:
-    value: Union[str, int, None] = sysconfig.get_config_var(name)
-    if value is None:
-        return default
-    return value
-
-
 def get_abi_tag() -> str:
     # The best solution to obtain the Python ABI is to parse the
     # $SOABI or $EXT_SUFFIX sysconfig variables as defined in PEP-314.
@@ -175,7 +163,7 @@ def get_platform_tag() -> str:
 
 
 class Tag:
-    def __init__(self, interpreter: Optional[str] = None, abi: Optional[str] = None, platform: Optional[str] = None):
+    def __init__(self, interpreter: str | None = None, abi: str | None = None, platform: str | None = None):
         self.interpreter = interpreter or get_interpreter_tag()
         self.abi = abi or get_abi_tag()
         self.platform = platform or get_platform_tag()