diff --git a/code/__HELPERS/_lists.dm b/code/__HELPERS/_lists.dm
index 393c5a465d..c24f93d32a 100644
--- a/code/__HELPERS/_lists.dm
+++ b/code/__HELPERS/_lists.dm
@@ -88,16 +88,21 @@
 			L -= V //No return here so that it removes all strings of that type
 	return
 
-//returns a new list with only atoms that are in typecache L
-/proc/typecache_filter_list(list/atoms, list/typecache, reversed=FALSE)
+
+/proc/typecache_filter_list(list/atoms, list/typecache)
 	. = list()
 	for (var/thing in atoms)
 		var/atom/A = thing
-		if (typecache[A.type] && !reversed)
-			. += A
-		else if(reversed)
+		if (typecache[A.type])
 			. += A
 
+/proc/typecache_filter_list_reverse(list/atoms, list/typecache)
+	. = list()
+	for (var/thing in atoms)
+		var/atom/A = thing
+		if (!typecache[A.type])
+ 			. += A
+
 //Like typesof() or subtypesof(), but returns a typecache instead of a list
 /proc/typecacheof(path, ignore_root_path, only_root_path = FALSE)
 	if(ispath(path))