diff --git a/code/modules/unit_tests/merge_type.dm b/code/modules/unit_tests/merge_type.dm
index 1aed82e6a3..c8db1c8562 100644
--- a/code/modules/unit_tests/merge_type.dm
+++ b/code/modules/unit_tests/merge_type.dm
@@ -1,6 +1,7 @@
 /datum/unit_test/merge_type/Run()
 	var/list/blacklist = list(/obj/item/stack/sheet,
 							  /obj/item/stack/sheet/mineral,
+							  /obj/item/stack/sheet/rglass/cyborg,
 							  /obj/item/stack/ore,
 							  /obj/item/stack/spacecash,
 							//   /obj/item/stack/license_plates,