diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index 698298c..ede719d 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -49,8 +49,8 @@ jobs:
     - name: Run tests
       # FIXME: Can this be run without elevated privileges?
       run: |
-        sudo $(command -v pytest)
-        coverage xml
+        sudo --preserve-env $(command -v pytest)
+        coverage xml --omit postroj/winrunner.py
 
     - name: Upload coverage results to Codecov
       uses: codecov/codecov-action@v3
diff --git a/testing/racker/test_run_windows.py b/testing/racker/test_run_windows.py
index 8bafa13..f3a09d0 100644
--- a/testing/racker/test_run_windows.py
+++ b/testing/racker/test_run_windows.py
@@ -14,6 +14,10 @@
 if "rackerhost-debian11" in socket.gethostname():
     pytest.skip("Nested virtualization with VT-x fails on developer's macOS workstation", allow_module_level=True)
 
+if "GITHUB_ACTIONS" in os.environ:
+    pytest.skip("Installing the Vagrant filesystem image for Windows "
+                "takes too much disk space on GitHub Actions", allow_module_level=True)
+
 
 def run_racker(command: str) -> subprocess.CompletedProcess:
     program_path = Path(sys.argv[0]).parent