diff --git a/src/DMAPI/tgs/core/datum.dm b/src/DMAPI/tgs/core/datum.dm
index ef6d3a4fe5..4d37ed662d 100644
--- a/src/DMAPI/tgs/core/datum.dm
+++ b/src/DMAPI/tgs/core/datum.dm
@@ -50,7 +50,7 @@ TGS_PROTECT_DATUM(/datum/tgs_api)
 /datum/tgs_api/proc/ChatTargetedBroadcast(message, admin_only)
 	return TGS_UNIMPLEMENTED
 
-/datum/tgs_api/proc/ChatPrivateMessage(message, admin_only)
+/datum/tgs_api/proc/ChatPrivateMessage(message, datum/tgs_chat_user/user)
 	return TGS_UNIMPLEMENTED
 
 /datum/tgs_api/proc/SecurityLevel()