diff --git a/code/modules/projectiles/ammunition/ballistic/shotgun.dm b/code/modules/projectiles/ammunition/ballistic/shotgun.dm
index d867321deea..e345922dc14 100644
--- a/code/modules/projectiles/ammunition/ballistic/shotgun.dm
+++ b/code/modules/projectiles/ammunition/ballistic/shotgun.dm
@@ -80,7 +80,7 @@
 	projectile_type = /obj/item/projectile/bullet/pellet/shotgun_incapacitate
 	pellets = 12//double the pellets, but half the stun power of each, which makes this best for just dumping right in someone's face.
 	variance = 25
-	materials = list(MAT_METAL=4000)
+	materials = list(/datum/material/iron=4000)
 
 /obj/item/ammo_casing/shotgun/improvised
 	name = "improvised shell"
diff --git a/code/modules/research/designs/autolathe_designs.dm b/code/modules/research/designs/autolathe_designs.dm
index 198421e974f..b6fa44ad4d0 100644
--- a/code/modules/research/designs/autolathe_designs.dm
+++ b/code/modules/research/designs/autolathe_designs.dm
@@ -792,7 +792,7 @@
 	name = ".357 Casing"
 	id = "a357"
 	build_type = AUTOLATHE
-	materials = list(MAT_METAL = 4000)
+	materials = list(/datum/material/iron = 4000)
 	build_path = /obj/item/ammo_casing/a357
 	category = list("hacked", "Security")