diff --git a/code/game/objects/items/RPD.dm b/code/game/objects/items/RPD.dm
index 41ddc22106..0549ebc474 100644
--- a/code/game/objects/items/RPD.dm
+++ b/code/game/objects/items/RPD.dm
@@ -331,7 +331,7 @@ GLOBAL_LIST_INIT(transit_tube_recipes, list(
 	//make sure what we're clicking is valid for the current category
 	var/static/list/make_pipe_whitelist
 	if(!make_pipe_whitelist)
-		make_pipe_whitelist = typecacheof(list(/obj/structure/lattice, /obj/structure/girder, /obj/item/pipe))
+		make_pipe_whitelist = typecacheof(list(/obj/structure/lattice, /obj/structure/girder, /obj/item/pipe, /obj/structure/window, /obj/structure/grille))
 	var/can_make_pipe = (isturf(A) || is_type_in_typecache(A, make_pipe_whitelist))
 
 	. = FALSE