diff --git a/code/game/objects/structures/door_assembly.dm b/code/game/objects/structures/door_assembly.dm
index 2a7ca416341..db202e16461 100644
--- a/code/game/objects/structures/door_assembly.dm
+++ b/code/game/objects/structures/door_assembly.dm
@@ -531,7 +531,7 @@ obj/structure/door_assembly
 					playsound(src.loc, 'sound/items/Crowbar.ogg', 100, 1)
 					user.visible_message("[user] adds [G.name] to the airlock assembly.", "You start to install [G.name] into the airlock assembly.")
 					if(do_after(user, 40))
-						if(C.get_amount() < 1 || mineral) return
+						if(G.get_amount() < 1 || mineral) return
 						user << "<span class='notice'>You've installed reinforced glass windows into the airlock assembly.</span>"
 						G.use(1)
 						mineral = "glass"
@@ -554,7 +554,7 @@ obj/structure/door_assembly
 						playsound(src.loc, 'sound/items/Crowbar.ogg', 100, 1)
 						user.visible_message("[user] adds [G.name] to the airlock assembly.", "You start to install [G.name] into the airlock assembly.")
 						if(do_after(user, 40))
-							if(C.get_amount() < 2 || mineral) return
+							if(G.get_amount() < 2 || mineral) return
 							user << "<span class='notice'>You've installed [M] plating into the airlock assembly.</span>"
 							G.use(2)
 							mineral = "[M]"