diff --git a/code/__DEFINES/MC.dm b/code/__DEFINES/MC.dm
index 7b7aacc9e5..cad75fbfe4 100644
--- a/code/__DEFINES/MC.dm
+++ b/code/__DEFINES/MC.dm
@@ -1,7 +1,5 @@
 #define MC_TICK_CHECK ( ( TICK_USAGE > Master.current_ticklimit || src.state != SS_RUNNING ) ? pause() : 0 )
 
-#define MC_TICK_REMAINING_MS ((Master.current_ticklimit - TICK_USAGE) * world.tick_lag)
-
 #define MC_SPLIT_TICK_INIT(phase_count) var/original_tick_limit = Master.current_ticklimit; var/split_tick_phases = ##phase_count
 #define MC_SPLIT_TICK \
 	if(split_tick_phases > 1){\
diff --git a/code/__DEFINES/_tick.dm b/code/__DEFINES/_tick.dm
index 7367240aa9..f4a8fbb9e5 100644
--- a/code/__DEFINES/_tick.dm
+++ b/code/__DEFINES/_tick.dm
@@ -23,6 +23,9 @@
 
 /// Returns true if tick_usage is above the limit
 #define TICK_CHECK ( TICK_USAGE > Master.current_ticklimit )
+
+#define TICK_REMAINING_MS ((Master.current_ticklimit - TICK_USAGE) * world.tick_lag)
+
 /// runs stoplag if tick_usage is above the limit
 #define CHECK_TICK ( TICK_CHECK ? stoplag() : 0 )
 
diff --git a/code/controllers/subsystem/air.dm b/code/controllers/subsystem/air.dm
index 86af777c44..92482b06cc 100644
--- a/code/controllers/subsystem/air.dm
+++ b/code/controllers/subsystem/air.dm
@@ -209,7 +209,7 @@ SUBSYSTEM_DEF(air)
 	// Heat -- slow and of questionable usefulness. Off by default for this reason. Pretty cool, though.
 	if(currentpart == SSAIR_TURF_CONDUCTION)
 		timer = TICK_USAGE_REAL
-		if(process_turf_heat(MC_TICK_REMAINING_MS))
+		if(process_turf_heat(TICK_REMAINING_MS))
 			pause()
 		cost_superconductivity = MC_AVERAGE(cost_superconductivity, TICK_DELTA_TO_MS(TICK_USAGE_REAL - timer))
 		if(state != SS_RUNNING)
@@ -358,7 +358,7 @@ SUBSYSTEM_DEF(air)
 			return
 
 /datum/controller/subsystem/air/proc/process_turf_equalize(resumed = 0)
-	if(process_turf_equalize_auxtools(resumed,MC_TICK_REMAINING_MS))
+	if(process_turf_equalize_auxtools(resumed,TICK_REMAINING_MS))
 		pause()
 	/*
 	//cache for sanic speed
@@ -378,7 +378,7 @@ SUBSYSTEM_DEF(air)
 	*/
 
 /datum/controller/subsystem/air/proc/process_turfs(resumed = 0)
-	if(process_turfs_auxtools(resumed,MC_TICK_REMAINING_MS))
+	if(process_turfs_auxtools(resumed,TICK_REMAINING_MS))
 		pause()
 	/*
 	//cache for sanic speed
@@ -397,15 +397,15 @@ SUBSYSTEM_DEF(air)
 	*/
 
 /datum/controller/subsystem/air/proc/process_excited_groups(resumed = 0)
-	if(process_excited_groups_auxtools(resumed,MC_TICK_REMAINING_MS))
+	if(process_excited_groups_auxtools(resumed,TICK_REMAINING_MS))
 		pause()
 
 /datum/controller/subsystem/air/proc/finish_turf_processing(resumed = 0)
-	if(finish_turf_processing_auxtools(MC_TICK_REMAINING_MS))
+	if(finish_turf_processing_auxtools(TICK_REMAINING_MS))
 		pause()
 
 /datum/controller/subsystem/air/proc/post_process_turfs(resumed = 0)
-	if(post_process_turfs_auxtools(resumed,MC_TICK_REMAINING_MS))
+	if(post_process_turfs_auxtools(resumed,TICK_REMAINING_MS))
 		pause()
 
 /datum/controller/subsystem/air/proc/finish_turf_processing_auxtools()
diff --git a/code/controllers/subsystem/callback.dm b/code/controllers/subsystem/callback.dm
index ecc65760f4..21c43f3e6c 100644
--- a/code/controllers/subsystem/callback.dm
+++ b/code/controllers/subsystem/callback.dm
@@ -10,5 +10,5 @@ SUBSYSTEM_DEF(callbacks)
 	CRASH("Auxtools not found! Callback subsystem shutting itself off.")
 
 /datum/controller/subsystem/callbacks/fire()
-	if(process_atmos_callbacks(MC_TICK_REMAINING_MS))
+	if(process_atmos_callbacks(TICK_REMAINING_MS))
 		pause()