diff --git a/code/controllers/subsystem/fastprocess.dm b/code/controllers/subsystem/fastprocess.dm
index 972f7ebe26c..8bed991dbdc 100644
--- a/code/controllers/subsystem/fastprocess.dm
+++ b/code/controllers/subsystem/fastprocess.dm
@@ -31,6 +31,6 @@ var/datum/subsystem/fastprocess/SSfastprocess
 		if(thing)
 			thing.process(wait)
 		else
-			SSfastprocess.processing.Remove(thing)
+			SSfastprocess.processing -= thing
 		if (MC_TICK_CHECK)
 			return