diff --git a/code/game/turfs/turf_changing.dm b/code/game/turfs/turf_changing.dm
index 27fbcf8956e..92b638a6754 100644
--- a/code/game/turfs/turf_changing.dm
+++ b/code/game/turfs/turf_changing.dm
@@ -27,11 +27,9 @@
 	if (!N)
 		return
 
-	// This makes sure that turfs are not changed to space when one side is part of a zone
-	if(N == /turf/space)
-		var/turf/below = GetBelow(src)
-		if(istype(below) && !istype(below,/turf/space))
-			N = /turf/simulated/open
+	// This makes sure that turfs are not changed to space when there's a multi-z turf below
+	if(N == /turf/space && HasBelow(z))
+		N = /turf/simulated/open
 
 	var/obj/fire/old_fire = fire
 	var/old_baseturf = baseturf