diff --git a/code/__DEFINES/MC.dm b/code/__DEFINES/MC.dm
index cbcf2c1dd9..97ce6ef6fd 100644
--- a/code/__DEFINES/MC.dm
+++ b/code/__DEFINES/MC.dm
@@ -19,8 +19,8 @@
 
 #define NEW_SS_GLOBAL(varname) if(varname != src){if(istype(varname)){Recover();qdel(varname);}varname = src;}
 
-#define START_PROCESSING(Processor, Datum) if (!Datum.isprocessing) {Datum.isprocessing = TRUE;Processor.processing += Datum}
-#define STOP_PROCESSING(Processor, Datum) Datum.isprocessing = FALSE;Processor.processing -= Datum
+#define START_PROCESSING(Processor, Datum) if (!(Datum.datum_flags & DF_ISPROCESSING)) {Datum.datum_flags |= DF_ISPROCESSING;Processor.processing += Datum}
+#define STOP_PROCESSING(Processor, Datum) Datum.datum_flags &= ~DF_ISPROCESSING;Processor.processing -= Datum
 
 //SubSystem flags (Please design any new flags so that the default is off, to make adding flags to subsystems easier)
 
diff --git a/code/__DEFINES/flags.dm b/code/__DEFINES/flags.dm
index 61249cb60a..f566492ec3 100644
--- a/code/__DEFINES/flags.dm
+++ b/code/__DEFINES/flags.dm
@@ -9,6 +9,7 @@ GLOBAL_LIST_INIT(bitflags, list(1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 204
 // for /datum/var/datum_flags
 #define DF_USE_TAG		(1<<0)
 #define DF_VAR_EDITED	(1<<1)
+#define DF_ISPROCESSING (1<<2)
 
 //FLAGS BITMASK
 
diff --git a/code/_globalvars/bitfields.dm b/code/_globalvars/bitfields.dm
index 6113e11eef..5ef8dc6d1b 100644
--- a/code/_globalvars/bitfields.dm
+++ b/code/_globalvars/bitfields.dm
@@ -35,7 +35,8 @@ GLOBAL_LIST_INIT(bitfields, list(
 		),
 	"datum_flags" = list(
 		"DF_USE_TAG" = DF_USE_TAG,
-		"DF_VAR_EDITED" = DF_VAR_EDITED
+		"DF_VAR_EDITED" = DF_VAR_EDITED,
+		"DF_ISPROCESSING" = DF_ISPROCESSING,
 		),
 	"item_flags" = list(
 		"BEING_REMOVED" = BEING_REMOVED,
diff --git a/code/controllers/subsystem/machines.dm b/code/controllers/subsystem/machines.dm
index eab61d4ef9..6d5d64fe6c 100644
--- a/code/controllers/subsystem/machines.dm
+++ b/code/controllers/subsystem/machines.dm
@@ -45,7 +45,7 @@ SUBSYSTEM_DEF(machines)
 		else
 			processing -= thing
 			if (!QDELETED(thing))
-				thing.isprocessing = FALSE
+				thing.datum_flags &= ~DF_ISPROCESSING
 		if (MC_TICK_CHECK)
 			return
 
diff --git a/code/controllers/subsystem/processing/processing.dm b/code/controllers/subsystem/processing/processing.dm
index f6d45ebff2..ef2a0f72e6 100644
--- a/code/controllers/subsystem/processing/processing.dm
+++ b/code/controllers/subsystem/processing/processing.dm
@@ -27,7 +27,6 @@ SUBSYSTEM_DEF(processing)
 		if (MC_TICK_CHECK)
 			return
 
-/datum/var/isprocessing = FALSE
 /datum/proc/process()
 	set waitfor = 0
 	STOP_PROCESSING(SSobj, src)
diff --git a/code/game/objects/structures/beds_chairs/chair.dm b/code/game/objects/structures/beds_chairs/chair.dm
index 93b8635dc5..498416f73f 100644
--- a/code/game/objects/structures/beds_chairs/chair.dm
+++ b/code/game/objects/structures/beds_chairs/chair.dm
@@ -385,7 +385,7 @@
 	turns = 0
 	if(!istype(user) || !user.canUseTopic(src, BE_CLOSE, ismonkey(user)))
 		return
-	if(!isprocessing)
+	if(!(datum_flags & DF_ISPROCESSING))
 		user.visible_message("<span class='notice'>[user] spins [src] around, and Ratvarian technology keeps it spinning FOREVER.</span>", \
 		"<span class='notice'>Automated spinny chairs. The pinnacle of Ratvarian technology.</span>")
 		START_PROCESSING(SSfastprocess, src)
diff --git a/code/modules/antagonists/clockcult/clock_structures/trap_triggers/repeater.dm b/code/modules/antagonists/clockcult/clock_structures/trap_triggers/repeater.dm
index 41292f818d..f5ed91ac15 100644
--- a/code/modules/antagonists/clockcult/clock_structures/trap_triggers/repeater.dm
+++ b/code/modules/antagonists/clockcult/clock_structures/trap_triggers/repeater.dm
@@ -12,7 +12,7 @@
 		return
 	if(!is_servant_of_ratvar(user))
 		return
-	if(!isprocessing)
+	if(!(datum_flags & DF_ISPROCESSING))
 		START_PROCESSING(SSprocessing, src)
 		to_chat(user, "<span class='notice'>You activate [src].</span>")
 		icon_state = "[icon_state]_on"
diff --git a/code/modules/projectiles/projectile.dm b/code/modules/projectiles/projectile.dm
index b0dc498bfa..4ee1363853 100644
--- a/code/modules/projectiles/projectile.dm
+++ b/code/modules/projectiles/projectile.dm
@@ -356,7 +356,7 @@
 	fired = TRUE
 	if(hitscan)
 		process_hitscan()
-	if(!isprocessing)
+	if(!(datum_flags & DF_ISPROCESSING))
 		START_PROCESSING(SSprojectiles, src)
 	pixel_move(1)	//move it now!