diff --git a/code/__DEFINES/subsystems.dm b/code/__DEFINES/subsystems.dm
index 3abef3a61c..06781b087c 100644
--- a/code/__DEFINES/subsystems.dm
+++ b/code/__DEFINES/subsystems.dm
@@ -115,6 +115,7 @@
 #define FIRE_PRIORITY_PARALLAX		65
 #define FIRE_PRIORITY_NPC			80
 #define FIRE_PRIORITY_MOBS			100
+#define FIRE_PRIORITY_PROJECTILES	100
 #define FIRE_PRIORITY_TGUI			110
 #define FIRE_PRIORITY_TICKER		200
 #define FIRE_PRIORITY_ATMOS_ADJACENCY	300