diff --git a/code/modules/research/designs/misc_designs.dm b/code/modules/research/designs/misc_designs.dm
index ebc1f8a39c..ae19b6d053 100644
--- a/code/modules/research/designs/misc_designs.dm
+++ b/code/modules/research/designs/misc_designs.dm
@@ -394,7 +394,7 @@
 	desc = "Adds the simple circuits to the RCD."
 	id = "rcd_upgrade_simple_circuits"
 	build_type = PROTOLATHE
-	materials = list(/datum/material/iron = 5000, /datum/material/glass = 2500, /datum/material/silver = 1500, /datum/material/titanium = 2000)
+	materials = list(/AT_METAL = 5000, MAT_GLASS = 2500, MAT_SILVER = 1500, MAT_TITANIUM = 2000)
 	build_path = /obj/item/rcd_upgrade/simple_circuits
 	category = list("Equipment")
 	departmental_flags = DEPARTMENTAL_FLAG_ENGINEERING