diff --git a/code/modules/mob/living/silicon/robot/robot_modules.dm b/code/modules/mob/living/silicon/robot/robot_modules.dm
index 6add592da8f..7aca17963bd 100644
--- a/code/modules/mob/living/silicon/robot/robot_modules.dm
+++ b/code/modules/mob/living/silicon/robot/robot_modules.dm
@@ -196,7 +196,7 @@
 
 	var/obj/item/stack/sheet/glass/reinforced/cyborg/RG = new /obj/item/stack/sheet/glass/reinforced/cyborg(src)
 	RG.synths = list(metal, glass)
-	src.modules += R
+	src.modules += RG
 
 /obj/item/weapon/robot_module/engineering
 	name = "engineering robot module"