diff --git a/code/__DEFINES/misc.dm b/code/__DEFINES/misc.dm
index 3da1aa8d24c0..1c2cc990e830 100644
--- a/code/__DEFINES/misc.dm
+++ b/code/__DEFINES/misc.dm
@@ -162,6 +162,7 @@
 #define MATRIX_NVG 1
 #define MATRIX_WIDE 2
 
+#define RESEARCH_UPGRADE_NULL null
 #define RESEARCH_UPGRADE_EXCLUDE_BUY -2
 #define RESEARCH_UPGRADE_CATEGORY -1 //lord forgive me
 #define RESEARCH_UPGRADE_TIER_1 1
diff --git a/code/datums/research_upgrade_datum.dm b/code/datums/research_upgrade_datum.dm
index 7362d243d12b..378256ef123a 100644
--- a/code/datums/research_upgrade_datum.dm
+++ b/code/datums/research_upgrade_datum.dm
@@ -120,7 +120,7 @@
 	change_purchase = -100
 	minimum_price = 100
 	item_reference = /obj/item/ammo_magazine/flamer_tank/custom/upgraded
-	behavior = null
+	behavior = RESEARCH_UPGRADE_NULL
 	upgrade_type = ITEM_ACCESSORY_UPGRADE
 
 /datum/research_upgrades/item/flamer_tank/smoke