diff --git a/.github/workflows/pypi-publish.yml b/.github/workflows/pypi-publish.yml
index 0a85579..0cf115e 100644
--- a/.github/workflows/pypi-publish.yml
+++ b/.github/workflows/pypi-publish.yml
@@ -88,7 +88,7 @@ jobs:
           ls -l dist
 
       - name: Publish package
-        uses: pypa/gh-action-pypi-publish@v1.8
+        uses: pypa/gh-action-pypi-publish@v1.8.11
         with:
           user: __token__
           password: ${{ secrets.PYPI_API_TOKEN }}
diff --git a/setup.py b/setup.py
index 464fd08..9dc00e4 100644
--- a/setup.py
+++ b/setup.py
@@ -1,6 +1,12 @@
+import platform
 import numpy as np
 from setuptools import Extension, setup
 
+if platform.system() == "Windows":
+    platform_flags = ["/Ox", "/fp:fast"]
+else:
+    platform_flags = ["-O3", "-ffast-math", "-march=native"]
+
 balltree = Extension(
     name="balltree.balltree",
     sources=[
@@ -17,9 +23,7 @@
     include_dirs=["include", np.get_include()],
     extra_compile_args=[
         "-Wall",
-        "-O3",
-        "-ffast-math",
-        "-march=native",
+        *platform_flags,
         "-DSET_PYERR_STRING",  # required to propagate C errors to python
     ],
 )