diff --git a/tests/fixtures/integration.py b/tests/fixtures/integration.py
index f2008716..213abc40 100644
--- a/tests/fixtures/integration.py
+++ b/tests/fixtures/integration.py
@@ -1,4 +1,5 @@
 import shutil
+import sys
 from collections.abc import Generator
 from pathlib import Path
 
@@ -12,7 +13,12 @@ def __init__(self, temporary_path: Path) -> None:
     def create_venv(self) -> tuple[Path, Path]:
         """Create a simulated virtual environment."""
         venv_path = self.temporary_path / "venv"
-        site_packages_path = venv_path / "lib" / "python3.9" / "site-packages"
+
+        if sys.platform == "win32":
+            site_packages_path = venv_path / "Lib" / "site-packages"
+        else:
+            site_packages_path = venv_path / "lib" / "python3.9" / "site-packages"
+
         site_packages_path.mkdir(parents=True)
         return venv_path, site_packages_path