diff --git a/cython/platform/config.h b/cython/platform/config.h
deleted file mode 100644
index 68720cdc..00000000
--- a/cython/platform/config.h
+++ /dev/null
@@ -1,3 +0,0 @@
-#ifndef SOLVESPACE_CONFIG_H
-#define SOLVESPACE_CONFIG_H
-#endif
diff --git a/cython/platform/patch.diff b/cython/platform/cygwinccompiler.diff
similarity index 100%
rename from cython/platform/patch.diff
rename to cython/platform/cygwinccompiler.diff
diff --git a/cython/platform/pyconfig.diff b/cython/platform/pyconfig.diff
new file mode 100644
index 00000000..0a31106c
--- /dev/null
+++ b/cython/platform/pyconfig.diff
@@ -0,0 +1,15 @@
+--- pyconfig.h	2016-01-27 10:54:56.000000000 +0300
++++ pyconfig.h	2016-03-28 11:46:48.000000000 +0300
+@@ -100,6 +100,12 @@
+ 
+ /* Compiler specific defines */
+ 
++#ifdef __MINGW32__
++#ifdef _WIN64
++#define MS_WIN64
++#endif
++#endif
++
+ /* ------------------------------------------------------------------------*/
+ /* Microsoft C defines _MSC_VER */
+ #ifdef _MSC_VER
diff --git a/cython/platform/set_pycompiler.bat b/cython/platform/set_pycompiler.bat
index 02d45e46..3e42cf8a 100644
--- a/cython/platform/set_pycompiler.bat
+++ b/cython/platform/set_pycompiler.bat
@@ -16,7 +16,8 @@ echo compiler=%COMPILER%>> "%DISTUTILS%"
 echo patched file "%DISTUTILS%"
 REM Apply the patch of "cygwinccompiler.py".
 REM Unix "patch" command of Msys.
-patch -N "%PYTHON_DIR%\lib\distutils\cygwinccompiler.py" "%HERE%\patch.diff"
+patch -N "%PYTHON_DIR%\lib\distutils\cygwinccompiler.py" "%HERE%\cygwinccompiler.diff"
+patch -N "%PYTHON_DIR%\include\pyconfig.h" "%HERE%\pyconfig.diff"
 
 REM Copy "vcruntime140.dll" to "libs".
 copy "%PYTHON_DIR%\vcruntime140.dll" "%PYTHON_DIR%\libs"
diff --git a/cython/setup.py b/cython/setup.py
index 4464a272..db57e607 100644
--- a/cython/setup.py
+++ b/cython/setup.py
@@ -22,7 +22,6 @@ from distutils import sysconfig
 include_path = pth_join('python_solvespace', 'include')
 src_path = pth_join('python_solvespace', 'src')
 platform_path = pth_join(src_path, 'platform')
-extra_path = 'platform'
 ver = sysconfig.get_config_var('VERSION')
 lib = sysconfig.get_config_var('BINDIR')
 
@@ -76,9 +75,6 @@ if {'sdist', 'bdist'} & set(sys.argv):
     for s in ('utilwin', 'utilunix', 'platform'):
         sources.append(pth_join(platform_path, f'{s}.cpp'))
 elif system() == 'Windows':
-    # Avoid compile error with CYTHON_USE_PYLONG_INTERNALS.
-    # https://github.com/cython/cython/issues/2670#issuecomment-432212671
-    macros.append(('MS_WIN64', None))
     # Disable format warning
     compile_args.append('-Wno-format')
     # Solvespace arguments
@@ -92,7 +88,7 @@ else:
 
 def copy_source(dry_run):
     dir_util.copy_tree(pth_join('..', 'include'), include_path, dry_run=dry_run)
-    dir_util.mkpath(pth_join('python_solvespace', 'src'))
+    dir_util.mkpath(src_path)
     for root, _, files in walk(pth_join('..', 'src')):
         for f in files:
             if not f.endswith('.h'):
@@ -104,6 +100,7 @@ def copy_source(dry_run):
             file_util.copy_file(f, f_new, dry_run=dry_run)
     for f in sources[1:]:
         file_util.copy_file(f.replace('python_solvespace', '..'), f, dry_run=dry_run)
+    open(pth_join(platform_path, 'config.h'), 'a').close()
 
 
 class Build(build_ext):
@@ -153,7 +150,7 @@ setup(
         "python_solvespace.slvs",
         sources,
         language="c++",
-        include_dirs=[include_path, src_path, platform_path, extra_path]
+        include_dirs=[include_path, src_path, platform_path]
     )],
     cmdclass={'build_ext': Build, 'sdist': PackSource},
     zip_safe=False,