diff --git a/sw/utility/simulation/simulators.py b/sw/utility/simulation/simulators.py
index 35443d3..0478f9b 100644
--- a/sw/utility/simulation/simulators.py
+++ b/sw/utility/simulation/simulators.py
@@ -302,7 +302,7 @@ class GenericMultithreadedSimulator:
 
             futures = []
 
-            for key, params in self._task_params.items():
+            for key, params in list(self._task_params.items()):
                 future = self._executor.submit(self._task_func, params)
                 future.add_done_callback(partial(done_callback, key))
                 futures.append(future)