diff --git a/code/game/gamemodes/gameticker.dm b/code/game/gamemodes/gameticker.dm
index e700059b22a..14948987199 100644
--- a/code/game/gamemodes/gameticker.dm
+++ b/code/game/gamemodes/gameticker.dm
@@ -66,7 +66,7 @@ var/datum/roundinfo/roundinfo = new()
 				var/list/area_turfs = get_area_turfs(area)
 				for(var/turf/T in area_turfs)
 					if(T.density)
-						turfs -= T
+						area_turfs -= T
 				vermin_spawn_turfs.Add(area_turfs)
 
 /datum/controller/gameticker/proc/setup()
@@ -331,7 +331,7 @@ var/datum/roundinfo/roundinfo = new()
 					spawning_vermin = 0
 					var/cur_alive_vermin = 0
 					//check to see if there are too many already
-					for(var/obj/effect/critter/roach/R in world))
+					for(var/obj/effect/critter/roach/R in world)
 						cur_alive_vermin++
 					for(var/mob/living/simple_animal/mouse/M in world)
 						if(!M.stat)
diff --git a/code/modules/mob/dead/observer/observer.dm b/code/modules/mob/dead/observer/observer.dm
index 4dd74250689..18b7eae9e53 100644
--- a/code/modules/mob/dead/observer/observer.dm
+++ b/code/modules/mob/dead/observer/observer.dm
@@ -169,13 +169,13 @@ This is the proc mobs get to turn into a ghost. Forked from ghostize due to comp
 			eligible_targets.Add(M)
 
 	var/mob/living/simple_animal/mouse/target_mouse
-	if(master_controller.game_ticker.spawn_vermin)
+	if(ticker.spawn_vermin)
 		if(eligible_targets.len)
 			//grab a random existing one
 			target_mouse = pick(eligible_targets)
 		else
 			//make a new mouse
-			target_mouse = new(pick(master_controller.game_ticker.vermin_spawn_turfs))
+			target_mouse = new(pick(ticker.vermin_spawn_turfs))
 
 	if(target_mouse)
 		client.mob = target_mouse