diff --git a/code/modules/admin/verbs/map_export.dm b/code/modules/admin/verbs/map_export.dm
index 74af2d01025..12ffc42813f 100644
--- a/code/modules/admin/verbs/map_export.dm
+++ b/code/modules/admin/verbs/map_export.dm
@@ -202,7 +202,7 @@ GLOBAL_LIST_INIT(save_file_chars, list(
 	maxz,
 	save_flag = ALL,
 	shuttle_area_flag = SAVE_SHUTTLEAREA_DONTCARE,
-	list/obj_blacklist = typesof(/obj/effect),
+	list/obj_blacklist = typecacheof(/obj/effect),
 )
 	var/width = maxx - minx
 	var/height = maxy - miny
@@ -212,9 +212,9 @@ GLOBAL_LIST_INIT(save_file_chars, list(
 		CRASH("Non-list being used as object blacklist for map writing")
 
 	// we want to keep crayon writings, blood splatters, cobwebs, etc.
-	obj_blacklist -= typesof(/obj/effect/decal)
-	obj_blacklist -= typesof(/obj/effect/turf_decal)
-	obj_blacklist -= typesof(/obj/effect/landmark) // most landmarks get deleted except for latejoin arrivals shuttle
+	obj_blacklist -= typecacheof(/obj/effect/decal)
+	obj_blacklist -= typecacheof(/obj/effect/turf_decal)
+	obj_blacklist -= typecacheof(/obj/effect/landmark) // most landmarks get deleted except for latejoin arrivals shuttle
 
 	//Step 0: Calculate the amount of letters we need (26 ^ n > turf count)
 	var/turfs_needed = width * height