diff --git a/src/ifcopenshell-python/test/bootstrap.py b/src/ifcopenshell-python/test/bootstrap.py
index ed0533d23e..1603fcdb26 100644
--- a/src/ifcopenshell-python/test/bootstrap.py
+++ b/src/ifcopenshell-python/test/bootstrap.py
@@ -35,7 +35,7 @@ class IFC4X3:
 class IFC4:
     @pytest.fixture(autouse=True)
     def setup(self):
-        self.file:ifcopenshell.file = ifcopenshell.api.run("project.create_file")
+        self.file: ifcopenshell.file = ifcopenshell.api.run("project.create_file")
         ifcopenshell.api.owner.settings.get_user = lambda ifc: (ifc.by_type("IfcPersonAndOrganization") or [None])[0]
         ifcopenshell.api.owner.settings.get_application = lambda ifc: (ifc.by_type("IfcApplication") or [None])[0]
         ifcopenshell.api.pre_listeners = {}
@@ -45,7 +45,7 @@ class IFC4:
 class IFC2X3:
     @pytest.fixture(autouse=True)
     def setup(self):
-        self.file:ifcopenshell.file = ifcopenshell.api.run("project.create_file", version="IFC2X3")
+        self.file: ifcopenshell.file = ifcopenshell.api.run("project.create_file", version="IFC2X3")
         ifcopenshell.api.owner.settings.get_user = lambda ifc: ifc.createIfcPersonAndOrganization()
         ifcopenshell.api.owner.settings.get_application = lambda ifc: ifc.createIfcApplication()
         ifcopenshell.api.pre_listeners = {}