diff --git a/code/game/objects/items/weapons/RPD.dm b/code/game/objects/items/weapons/RPD.dm
index 22f68c88e6a..bd608e6b725 100644
--- a/code/game/objects/items/weapons/RPD.dm
+++ b/code/game/objects/items/weapons/RPD.dm
@@ -570,7 +570,8 @@ GLOBAL_LIST_INIT(RPD_recipes, list(
 				new /obj/item/pipe_meter(A)
 
 		if(DISPOSALS_MODE) //Making disposals pipes
-			if(isindestructiblewall(A))
+			if(isclosedturf(A))
+				to_chat(user, "<span class='warning'>[src]'s error light flickers; there's something in the way!</span>")
 				return
 			to_chat(user, "<span class='notice'>You start building a disposals pipe...</span>")
 			playsound(get_turf(src), 'sound/machines/click.ogg', 50, 1)