diff --git a/code/modules/antagonists/traitor/objectives/demoralise_poster.dm b/code/modules/antagonists/traitor/objectives/demoralise_poster.dm
index 87e4cc90603..b058b9f2efa 100644
--- a/code/modules/antagonists/traitor/objectives/demoralise_poster.dm
+++ b/code/modules/antagonists/traitor/objectives/demoralise_poster.dm
@@ -59,7 +59,7 @@
  * Arguments
  * * victim - A mob who just got something stuck in their hand.
  */
-/datum/traitor_objective/demoralise/poster/proc/on_triggered_trap(mob/victim)
+/datum/traitor_objective/demoralise/poster/proc/on_triggered_trap(datum/source, mob/victim)
 	SIGNAL_HANDLER
 	on_mood_event(victim.mind)