diff --git a/Source/HBIOS/Config/RCZ80_duart.asm b/Source/HBIOS/Config/RCZ80_duart.asm
index b539bdb7..90ba7809 100644
--- a/Source/HBIOS/Config/RCZ80_duart.asm
+++ b/Source/HBIOS/Config/RCZ80_duart.asm
@@ -28,5 +28,5 @@
 ;
 #include "Config/RCZ80_std.asm"
 ;
-DUARTENABLE	.EQU	TRUE		; DUART: ENABLE 2681/2692 SERIAL DRIVER (DUART.ASM)
-DUARTCNT	.EQU	1		; DUART: NUMBER OF CHIPS TO DETECT (1-2)
+DUARTENABLE	.SET	TRUE		; DUART: ENABLE 2681/2692 SERIAL DRIVER (DUART.ASM)
+DUARTCNT	.SET	1		; DUART: NUMBER OF CHIPS TO DETECT (1-2)