diff --git a/setup.py b/setup.py
index 5b05e71..029a0cb 100644
--- a/setup.py
+++ b/setup.py
@@ -1,7 +1,4 @@
-import platform
-import sys
 from setuptools import setup, find_packages
-from setuptools.command.build_ext import build_ext
 from codecs import open
 from os import path
 
@@ -11,18 +8,6 @@
     long_description = f.read()
 
 
-class custom_build_ext(build_ext):
-    """Custom build_ext command that uses mingw32 when building on Python2.7
-    in Windows."""
-
-    def finalize_options(self):
-        build_ext.finalize_options(self)
-        is_windows = platform.system() == 'Windows'
-        is_py2 = sys.version_info[0] < 3
-        if self.compiler is None and is_windows and is_py2:
-            self.compiler = 'mingw32'
-
-
 setup(
     name='cmarkgfm',
     version='2024.11.20',
@@ -58,7 +43,4 @@ def finalize_options(self):
     },
     zip_safe=False,
     include_package_data=True,
-    cmdclass={
-        'build_ext': custom_build_ext,
-    },
 )
diff --git a/src/cmarkgfm/build_cmark.py b/src/cmarkgfm/build_cmark.py
index 3d140ca..176ffd1 100644
--- a/src/cmarkgfm/build_cmark.py
+++ b/src/cmarkgfm/build_cmark.py
@@ -3,7 +3,6 @@
 import glob
 import io
 import os
-import sys
 
 import cffi
 
@@ -58,10 +57,11 @@ def _compiler_type():
 
 
 COMPILER_TYPE = _compiler_type()
-PY2 = sys.version_info[0] < 3
-# Note: on Python 2.7 in Windows we're using mingw so we use the unix
-# srcs for that as well.
-if COMPILER_TYPE in {'unix', 'mingw32'} or PY2:
+# Note: on Windows with MSVC the compiler type is 'msvc'. On macOS and
+# Linux it is 'unix'. For MinGW on Windows distutils reports 'mingw32'.
+# Select the appropriate compile args and generated sources directory
+# based solely on the compiler type.
+if COMPILER_TYPE in {'unix', 'mingw32'}:
     EXTRA_COMPILE_ARGS = ['-std=c99']
     GENERATED_SRC_DIR = UNIX_GENERATED_SRC_DIR
 elif COMPILER_TYPE == 'msvc':