diff --git a/code/modules/research/designs/medical_designs.dm b/code/modules/research/designs/medical_designs.dm
index d8d68f4eb0..2f6eb535cc 100644
--- a/code/modules/research/designs/medical_designs.dm
+++ b/code/modules/research/designs/medical_designs.dm
@@ -374,7 +374,7 @@
 	desc = "An implanted riot shield, designed to be installed on subject's arm."
 	id = "ci-shield"
 	build_type = PROTOLATHE
-	materials = list (MAT_METAL = 8500, MAT_GLASS = 8500, MAT_SILVER = 1800, MAT_TITANIUM = 600)
+	materials = list (/datum/material/iron = 8500, /datum/material/glass = 8500, /datum/material/silver = 1800, /datum/material/irontitanium = 600)
 	construction_time = 200
 	build_path = /obj/item/organ/cyberimp/arm/shield
 	category = list("Misc", "Medical Designs")
@@ -385,7 +385,7 @@
 	desc = "A set of janitor tools fitted into an arm implant, designed to be installed on subject's arm."
 	id = "ci-janitor"
 	build_type = PROTOLATHE | MECHFAB
-	materials = list (MAT_METAL = 3500, MAT_GLASS = 1500, MAT_SILVER = 1500)
+	materials = list (/datum/material/iron = 3500, /datum/material/glass = 1500, /datum/material/silver = 1500)
 	construction_time = 200
 	build_path = /obj/item/organ/cyberimp/arm/janitor
 	category = list("Misc", "Medical Designs")
@@ -396,7 +396,7 @@
 	desc = "Everything a cook or barkeep needs in an arm implant, designed to be installed on subject's arm."
 	id = "ci-service"
 	build_type = PROTOLATHE | MECHFAB
-	materials = list (MAT_METAL = 3500, MAT_GLASS = 1500, MAT_SILVER = 1500)
+	materials = list (/datum/material/ironL = 3500, /datum/material/glass = 1500, /datum/material/silver = 1500)
 	construction_time = 200
 	build_path = /obj/item/organ/cyberimp/arm/service
 	category = list("Misc", "Medical Designs")