diff --git a/code/citadel/crew_objectives/cit_crewobjectives_cargo.dm b/code/citadel/crew_objectives/cit_crewobjectives_cargo.dm
index d164123c4d..010337b49f 100644
--- a/code/citadel/crew_objectives/cit_crewobjectives_cargo.dm
+++ b/code/citadel/crew_objectives/cit_crewobjectives_cargo.dm
@@ -17,11 +17,11 @@
 	var/petcount = target_amount
 	for(var/mob/living/simple_animal/pet/P in GLOB.mob_list)
 		if(!(P.stat == DEAD))
-			if(P.z == ZLEVEL_STATION_PRIMARY || SSshuttle.emergency.shuttle_areas[get_area(P)])
+			if(P.z == SSmapping.station_start || SSshuttle.emergency.shuttle_areas[get_area(P)])
 				petcount--
 	for(var/mob/living/carbon/human/H in GLOB.mob_list)
 		if(!(H.stat == DEAD))
-			if(H.z == ZLEVEL_STATION_PRIMARY || SSshuttle.emergency.shuttle_areas[get_area(H)])
+			if(H.z == SSmapping.station_start || SSshuttle.emergency.shuttle_areas[get_area(H)])
 				if(istype(H.wear_neck, /obj/item/clothing/neck/petcollar))
 					petcount--
 	if(petcount <= 0)
diff --git a/code/citadel/crew_objectives/cit_crewobjectives_civilian.dm b/code/citadel/crew_objectives/cit_crewobjectives_civilian.dm
index 0a867266ad..c0e6cf6bb1 100644
--- a/code/citadel/crew_objectives/cit_crewobjectives_civilian.dm
+++ b/code/citadel/crew_objectives/cit_crewobjectives_civilian.dm
@@ -65,7 +65,7 @@
 /datum/objective/crew/responsibility/check_completion()
 	for(var/mob/living/carbon/human/H in GLOB.mob_list)
 		if(H.stat == DEAD && H.drunkenness >= 80)
-			if(H.z == ZLEVEL_STATION_PRIMARY || SSshuttle.emergency.shuttle_areas[get_area(H)])
+			if(H.z == SSmapping.station_start || SSshuttle.emergency.shuttle_areas[get_area(H)])
 				return FALSE
 	return TRUE
 
diff --git a/code/citadel/crew_objectives/cit_crewobjectives_medical.dm b/code/citadel/crew_objectives/cit_crewobjectives_medical.dm
index 53a9dc73aa..21d7a040aa 100644
--- a/code/citadel/crew_objectives/cit_crewobjectives_medical.dm
+++ b/code/citadel/crew_objectives/cit_crewobjectives_medical.dm
@@ -6,7 +6,7 @@
 
 /datum/objective/crew/morgue/check_completion()
 	for(var/mob/living/carbon/human/H in GLOB.mob_list)
-		if(H.stat == DEAD && H.z == ZLEVEL_STATION_PRIMARY)
+		if(H.stat == DEAD && H.z == SSmapping.station_start)
 			if(get_area(H) != /area/medical/morgue)
 				return FALSE
 	return TRUE
@@ -80,7 +80,7 @@
 /datum/objective/crew/noinfections/check_completion()
 	for(var/mob/living/carbon/human/H in GLOB.mob_list)
 		if(!H.stat == DEAD)
-			if(H.z == ZLEVEL_STATION_PRIMARY || SSshuttle.emergency.shuttle_areas[get_area(H)])
+			if(H.z == SSmapping.station_start || SSshuttle.emergency.shuttle_areas[get_area(H)])
 				if(H.check_virus() == 2)
 					return FALSE
 	return TRUE
diff --git a/code/modules/antagonists/borer/borer_event.dm b/code/modules/antagonists/borer/borer_event.dm
index e036c2a474..94af2f1be7 100644
--- a/code/modules/antagonists/borer/borer_event.dm
+++ b/code/modules/antagonists/borer/borer_event.dm
@@ -26,7 +26,7 @@
 	for(var/obj/machinery/atmospherics/components/unary/vent_pump/temp_vent in GLOB.machines)
 		if(QDELETED(temp_vent))
 			continue
-		if(temp_vent.loc.z == ZLEVEL_STATION_PRIMARY && !temp_vent.welded)
+		if(temp_vent.loc.z == SSmapping.station_start && !temp_vent.welded)
 			var/datum/pipeline/temp_vent_parent = temp_vent.parents[1]
 			if(temp_vent_parent.other_atmosmch.len > 20)
 				vents += temp_vent