diff --git a/src/+gui_auxiliary/set_command_option.m b/src/+gui_auxiliary/set_command_option.m
index c9883565316c074cd40a3d7006e7db0095582a62..fdb4d3f407ecc4cf1f87f5af8742ca63f361631f 100644
--- a/src/+gui_auxiliary/set_command_option.m
+++ b/src/+gui_auxiliary/set_command_option.m
@@ -98,7 +98,7 @@ try
             end
 
         case 'filter_step_ahead'
-            options_.filter_step_ahead = eval(value);
+            options_.filter_step_ahead = str2num(value);
             
         case 'mcmc_jumping_covariance'
             if value == 2