diff --git a/src/bonsai/bonsai/bim/module/qto/prop.py b/src/bonsai/bonsai/bim/module/qto/prop.py
index 23f6f707c5..fd5c1d58e8 100644
--- a/src/bonsai/bonsai/bim/module/qto/prop.py
+++ b/src/bonsai/bonsai/bim/module/qto/prop.py
@@ -48,6 +48,8 @@ def get_calculator(self: "BIMQtoProperties", context: bpy.types.Context) -> list
     results: list[tuple[str, str, str]] = []
     for name, calculator in ifc5d.qto.calculators.items():
         results.append((name, name, calculator.__doc__ or ""))
+    # Make IfcOpenShell appear first.
+    results.sort(key=lambda x: x[0] == "IfcOpenShell", reverse=True)
     return results