diff --git a/src/system/its.1648 b/src/system/its.1648
index f475f483..ef763a93 100644
--- a/src/system/its.1648
+++ b/src/system/its.1648
@@ -8909,7 +8909,7 @@ NACCES:	MOVEI T,AIOCAL	;GET <CLSTB BITS>,,<IOCHNM WD ADDR> IN R
 	MOVSI J,NACCE1
 	JRST CHNDCD
 
-NACCE1:	TLNN R,%CLSQ\%CLSU\%CLSFU
+NACCE1:	TLNN R,%CLSQ\%CLSU\%CLSFU\%CLS6
 	 JRST OPNL34
 	HRRM B,IOCHST-IOCHNM(R)	;STORE USR .ACCESS POINTER
 	TLNN R,%CLSQ