diff --git a/code/game/mecha/mech_fabricator.dm b/code/game/mecha/mech_fabricator.dm
index ce90bf50b4f..7f35b5c2681 100644
--- a/code/game/mecha/mech_fabricator.dm
+++ b/code/game/mecha/mech_fabricator.dm
@@ -262,7 +262,7 @@
 		if(!istype(queue))
 			queue = list()
 		if(part)
-			queue[++queue.len] = part
+			queue.Add(part)
 		return queue.len
 
 	proc/remove_from_queue(index)