port tgstation/tgstation#52409

code/__DEFINES/subsystems.dm

@@ -121,6 +121,7 @@
 #define FIRE_PRIORITY_CHAT			400
 #define FIRE_PRIORITY_RUNECHAT		410
 #define FIRE_PRIORITY_OVERLAYS		500
+#define FIRE_PRIORITY_TIMER			700
 #define FIRE_PRIORITY_INPUT			1000 // This must always always be the max highest priority. Player input must never be lost.
 
 // SS runlevels

code/controllers/subsystem/timer.dm

@@ -7,6 +7,7 @@ SUBSYSTEM_DEF(timer)
 	name = "Timer"
 	wait = 1 //SS_TICKER subsystem, so wait is in ticks
 	init_order = INIT_ORDER_TIMER
+	priority = FIRE_PRIORITY_TIMER
 
 	flags = SS_TICKER|SS_NO_INIT