diff --git a/src/ifcopenshell-python/test/test_wall_opening.py b/src/ifcopenshell-python/test/test_wall_opening.py
index 75da8af33d..f331297e73 100644
--- a/src/ifcopenshell-python/test/test_wall_opening.py
+++ b/src/ifcopenshell-python/test/test_wall_opening.py
@@ -145,7 +145,7 @@ def create_case(fn, openings):
 
 
 class TestWallOpenings:
-    @pytest.mark.skipif(shutil.which("IfcConvert"), reason="Requires IfcConvert in path")
+    @pytest.mark.skipif(shutil.which("IfcConvert") is None, reason="Requires IfcConvert in path")
     def test_all(self):
 
         cases = [
@@ -245,4 +245,4 @@ class TestWallOpenings:
 
 
 if __name__ == "__main__":
-    TestWallOpenings().test_all()
+    pytest.main(["-x", __file__])