diff --git a/tools/charactercreation/charactertool.xml b/tools/charactercreation/charactertool.xml
index f03e2da..5880ad7 100644
--- a/tools/charactercreation/charactertool.xml
+++ b/tools/charactercreation/charactertool.xml
@@ -4064,7 +4064,7 @@
                         <ValueButtons>
                             <Output>[data.character.magic.mana]</Output>
                             <Budget>[data.character.control.xp]</Budget>
-                            <Cost>charlib_cost_mana(param.0)</Cost>
+                            <Cost>charlib_cost_mana([param.0])</Cost>
                             <Min>10</Min>
                             <Max>40</Max>
                             <Buttons>