diff --git a/code/modules/admin/verbs/massmodvar.dm b/code/modules/admin/verbs/massmodvar.dm
index 873a2e5463c..df153f62874 100644
--- a/code/modules/admin/verbs/massmodvar.dm
+++ b/code/modules/admin/verbs/massmodvar.dm
@@ -465,7 +465,7 @@
 					A.on_varedit(variable)
 
 		else if(istype(O,/turf))
-			for(var/turf/A in world)
+			for(var/turf/A in block(locate(1,1,1),locate(world.maxx,world.maxy,world.maxz)))
 				if(istype(A,O.type))
 					A.on_varedit(variable)