diff --git a/data/campaigns/The_Hammer_of_Thursagan/scenarios/12_The_Underlevels.cfg b/data/campaigns/The_Hammer_of_Thursagan/scenarios/12_The_Underlevels.cfg
index bcc79d6dedb..c499b7f76bb 100644
--- a/data/campaigns/The_Hammer_of_Thursagan/scenarios/12_The_Underlevels.cfg
+++ b/data/campaigns/The_Hammer_of_Thursagan/scenarios/12_The_Underlevels.cfg
@@ -22,11 +22,6 @@
     {STARTING_VILLAGES 3 3}
     {STARTING_VILLAGES 4 9}
 
-    [set_variable]
-        name=liches_active
-        value=no
-    [/set_variable]
-
     turns=-1
 
     [side]
@@ -288,6 +283,12 @@
 
     [event]
         name="prestart"
+
+        [set_variable]
+            name=liches_active
+            value=no
+        [/set_variable]
+
         {PLACE_IMAGE "scenery/dwarven-doors-closed.png" 38 42}
         {PLACE_IMAGE "scenery/dwarven-doors-closed.png" 39 42}
         {PLACE_IMAGE "scenery/dwarven-doors-closed.png" 40 42}