diff --git a/cmake/cmake_extension.py b/cmake/cmake_extension.py
index 1133c25..ceb0d61 100644
--- a/cmake/cmake_extension.py
+++ b/cmake/cmake_extension.py
@@ -2,6 +2,7 @@
 
 import glob
 import os
+import platform
 import shutil
 import sys
 from pathlib import Path
@@ -15,6 +16,10 @@ def is_for_pypi():
     return ans is not None
 
 
+def is_macos():
+    return platform.system() == "Darwin"
+
+
 try:
     from wheel.bdist_wheel import bdist_wheel as _bdist_wheel
 
@@ -23,7 +28,7 @@ try:
             _bdist_wheel.finalize_options(self)
             # In this case, the generated wheel has a name in the form
             # k2-xxx-pyxx-none-any.whl
-            if is_for_pypi():
+            if is_for_pypi() and not is_macos():
                 self.root_is_pure = True
             else:
                 # The generated wheel has a name ending with