diff --git a/src/system/its.1650 b/src/system/its.1650
index 903cabf6..954b8858 100644
--- a/src/system/its.1650
+++ b/src/system/its.1650
@@ -19607,7 +19607,7 @@ UBAASL:	PUSH P,B
 
 UBASL1:	MOVNS B
 	MOVSI A,400000
-	LSH A,B			;A/ bit to snarf
+	LSH A,(B)		;A/ bit to snarf
 	ANDCAM A,UBAIFS
 	CONO PI,PION
 	MOVN A,B