diff --git a/Source/HBIOS/dbgmon.asm b/Source/HBIOS/dbgmon.asm
index af3f28aa..0fb680df 100644
--- a/Source/HBIOS/dbgmon.asm
+++ b/Source/HBIOS/dbgmon.asm
@@ -33,7 +33,7 @@ BUFLEN	.EQU	40			; INPUT LINE LENGTH
 ;
 #IF DSKYENABLE
   #DEFINE USEDELAY
-ENA_XM	.SET	FALSE			; NO ROOM FOR BOTH DSKY+XMODEM
+ENA_XM	.EQU	FALSE			; NO ROOM FOR BOTH DSKY+XMODEM
 #ELSE
 ENA_XM	.EQU	TRUE			; INCLUDE XMODEM IF SPACE AVAILABLE
 #ENDIF