diff --git a/matlab/stoch_simul.m b/matlab/stoch_simul.m
index 333230549..53977a215 100644
--- a/matlab/stoch_simul.m
+++ b/matlab/stoch_simul.m
@@ -31,6 +31,10 @@ end
 
 if options_.partial_information == 1 || options_.ACES_solver == 1
     PI_PCL_solver = 1;
+    if options_.order ~= 1
+        warning('STOCH_SIMUL: forcing order=1 since you are using partial_information or ACES solver')
+        options_.order = 1;
+    end
 else
     PI_PCL_solver = 0;
 end