diff --git a/data/campaigns/Heir_To_The_Throne/utils/abilities.cfg b/data/campaigns/Heir_To_The_Throne/utils/abilities.cfg
index ea4d5621fb0f..14bc5e10a531 100644
--- a/data/campaigns/Heir_To_The_Throne/utils/abilities.cfg
+++ b/data/campaigns/Heir_To_The_Throne/utils/abilities.cfg
@@ -83,6 +83,8 @@ _"This unit's grasp of melee tactics allows adjacent allies to strike the first
         [filter]
             {LACKS_INITIATIVE_FILTER}
         [/filter]
+        [allow_undo]
+        [/allow_undo]
 
         {INITIATIVE_OBJECT x,y=$x1,$y1}
     [/event]