diff --git a/src/system/itsdev.974 b/src/system/itsdev.974
index 04615974..ba650667 100755
--- a/src/system/itsdev.974
+++ b/src/system/itsdev.974
@@ -2189,7 +2189,10 @@ DRECY1:
 SRCY1:	HRRZ A,LDISP
 	JUMPE A,ENDLIS
 	JSP B,DPFTCH
-	JUMPL A,SRCY2A	;SINGLE BLKO PNTR
+IFN 1,[ CAML A,[777000,,0]
+         JRST SRCY2A	;SINGLE BLKO PNTR
+]
+.ELSE	JUMPL A,SRCY2A	;SINGLE BLKO PNTR
 	MOVEM A,LDISP	;LIST
 	HLRZS A
 	JUMPE A,SRCY5	;THIS ENTRY NULL