diff --git a/src/ifcopenshell-python/ifcopenshell/util/file.py b/src/ifcopenshell-python/ifcopenshell/util/file.py
index 709018e676..aa83db107d 100644
--- a/src/ifcopenshell-python/ifcopenshell/util/file.py
+++ b/src/ifcopenshell-python/ifcopenshell/util/file.py
@@ -17,7 +17,8 @@
 # along with IfcOpenShell.  If not, see <http://www.gnu.org/licenses/>.
 
 import zipfile
-from typing import IO, Union, TypedDict, NotRequired
+from typing import IO, Union, TypedDict
+from typing_extensions import NotRequired
 
 
 class HeaderMetadata(TypedDict):