diff --git a/pyproject.toml b/pyproject.toml
index 88fc4867e8..299f8736cd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -28,6 +28,7 @@ extend-exclude = '''
     src/ifcopenshell-python/ifcopenshell/express/*
     |src/ifcopenshell-python/ifcopenshell/mvd/*
     |src/ifc2ca/templates/*
+    |src/ifcconvert/cityjson/*
 '''
 
 [tool.pyright]