diff --git a/kratos/python_scripts/multistage_orchestrators/multistage_orchestrator.py b/kratos/python_scripts/multistage_orchestrators/multistage_orchestrator.py
index 5e0aa98ac544..30b982d4edf6 100644
--- a/kratos/python_scripts/multistage_orchestrators/multistage_orchestrator.py
+++ b/kratos/python_scripts/multistage_orchestrators/multistage_orchestrator.py
@@ -22,7 +22,7 @@ def __init__(self, project : Project) -> None:
 
         # Store pointer to current project
         # Note that the project already contains the multistage simulation settings
-        self.__project = project
+        self.__project: Project = project
 
     def Run(self):
         """Main function that runs the complete multistage simulation."""