diff --git a/optimas/core/trial.py b/optimas/core/trial.py
index 529f1f23..efcafa4d 100644
--- a/optimas/core/trial.py
+++ b/optimas/core/trial.py
@@ -121,7 +121,7 @@ def from_dict(
             which will be included in the optimization history.
         """
         # Prepare values of the input parameters
-        parameter_values = {trial_dict[var.name] for var in varying_parameters}
+        parameter_values = [trial_dict[var.name] for var in varying_parameters]
         # Prepare evaluations
         evaluations = [
             Evaluation(parameter=par, value=trial_dict[par.name])