diff --git a/src/system/its.1648 b/src/system/its.1648
index e1289983..a1958d0a 100644
--- a/src/system/its.1648
+++ b/src/system/its.1648
@@ -19594,7 +19594,7 @@ UBAASL:	PUSH P,B
 
 UBASL1:	MOVNS B
 	MOVSI A,400000
-	LSH A,B			;A/ bit to snarf
+	LSH A,0(B)		;A/ bit to snarf
 	ANDCAM A,UBAIFS
 	CONO PI,PION
 	MOVN A,B