diff --git a/code/game/objects/items/devices/PDA/cart.dm b/code/game/objects/items/devices/PDA/cart.dm
index fc94e03c39..879860b7b5 100644
--- a/code/game/objects/items/devices/PDA/cart.dm
+++ b/code/game/objects/items/devices/PDA/cart.dm
@@ -48,9 +48,10 @@
 	var/mob/living/simple_animal/bot/active_bot
 	var/list/botlist = list()
 
-/obj/item/weapon/cartridge/Initialize(var/obj/item/device/pda/pda)
-	..()
-	if(pda)
+/obj/item/weapon/cartridge/Initialize()
+	. = ..()
+	var/obj/item/device/pda/pda = loc
+	if(istype(pda))
 		host_pda = pda
 
 /obj/item/weapon/cartridge/engineering