diff --git a/code/game/machinery/computer/card.dm b/code/game/machinery/computer/card.dm
index 8914d5b6ff4..9e79a702fc4 100644
--- a/code/game/machinery/computer/card.dm
+++ b/code/game/machinery/computer/card.dm
@@ -245,7 +245,9 @@
 			if (authenticated)
 				var/t1 = href_list["assign_target"]
 				if(t1 == "Custom")
-					t1 = input("Enter a custom job assignment.","Assignment")
+					var/temp_t = copytext(sanitize(input("Enter a custom job assignment.","Assignment")),1,MAX_MESSAGE_LEN)
+					if(temp_t)
+						t1 = temp_t
 				else
 					modify.access = ( istype(src,/obj/machinery/computer/card/centcom) ? get_centcom_access(t1) : get_access(t1) )
 				if (modify)