diff --git a/navalplanner-webapp/src/main/webapp/planner/montecarlo_function.zul b/navalplanner-webapp/src/main/webapp/planner/montecarlo_function.zul
index b80c57aa9..c4c39dbba 100644
--- a/navalplanner-webapp/src/main/webapp/planner/montecarlo_function.zul
+++ b/navalplanner-webapp/src/main/webapp/planner/montecarlo_function.zul
@@ -43,11 +43,11 @@
         <grid>
             <columns>
                 <column width="150px"/>
-                <column />
+                <column hflex="2"/>
+                <column width="150px" />
+                <column hflex="2"/>
                 <column width="150px"/>
-                <column />
-                <column width="150px"/>
-                <column />
+                <column hflex="1"/>
             </columns>
             <rows>
                 <row>