diff --git a/pyaedt/modules/MeshIcepak.py b/pyaedt/modules/MeshIcepak.py
index 535084cdb57..32b4d43a82d 100644
--- a/pyaedt/modules/MeshIcepak.py
+++ b/pyaedt/modules/MeshIcepak.py
@@ -509,9 +509,9 @@ def keys(self):
             Available settings keys.
         """
         if self._mesh_class.manual_settings:
-            return {**self._manual_mesh_settings, **self._common_mesh_settings}.keys()
+            return set(self._manual_mesh_settings.keys()) | set(self._common_mesh_settings.keys())
         else:
-            return {**self._automatic_mesh_settings, **self._common_mesh_settings}.keys()
+            return set(self._automatic_mesh_settings.keys()) | set(self._common_mesh_settings.keys())
 
     def values(self):
         """