diff --git a/matlab/global_initialization.m b/matlab/global_initialization.m
index 6c3797eb01e902a780c01598d947d971495814ae..ebe2a04d2a65a4938c28315f4f22d59c395066bb 100644
--- a/matlab/global_initialization.m
+++ b/matlab/global_initialization.m
@@ -480,6 +480,7 @@ simplex.maxiter = 5000;
 simplex.maxfcallfactor = 500;
 simplex.maxfcall = [];
 simplex.verbosity = 2;
+simplex.delta_factor=0.05;
 options_.simplex = simplex;
 
 % CMAES optimization routine.