diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ff48d2d..b7e9eb1 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -34,6 +34,8 @@ jobs:
 
       - name: Install packages
         run: pdm install
+      - name: Run Pre-Commit Tests
+        uses: pre-commit/action@v3.0.0
       - name: Run Integration
         run: pdm run findpython --all -v
       - name: Run Tests
diff --git a/src/findpython/pep514tools/_registry.py b/src/findpython/pep514tools/_registry.py
index 16cd93a..7502b2a 100644
--- a/src/findpython/pep514tools/_registry.py
+++ b/src/findpython/pep514tools/_registry.py
@@ -12,18 +12,27 @@
     "REGISTRY_SOURCE_CU",
 ]
 
+import sys
 import re
 from itertools import count
 
-try:
-    import winreg
-except ImportError:
-    import _winreg as winreg
-
 REGISTRY_SOURCE_LM = 1
 REGISTRY_SOURCE_LM_WOW6432 = 2
 REGISTRY_SOURCE_CU = 3
 
+# Simple tests direcly on sys variables are necessary to please mypy
+if sys.platform == "win32":
+    if sys.version_info >= (3,):
+        import winreg
+    else:
+        import _winreg as winreg
+else:
+    def open_source():
+        pass
+
+# Prevents mypy (and python) from parsing further on non-win32 platforms
+assert sys.platform == "win32"
+
 _REG_KEY_INFO = {
     REGISTRY_SOURCE_LM: (
         winreg.HKEY_LOCAL_MACHINE,