diff --git a/Source/HBIOS/cfg_RCEZ80.asm b/Source/HBIOS/cfg_RCEZ80.asm
index 1b6f006a..20a512a9 100644
--- a/Source/HBIOS/cfg_RCEZ80.asm
+++ b/Source/HBIOS/cfg_RCEZ80.asm
@@ -414,7 +414,7 @@ EZ80IOBASE	.SET	$FF		; EZ80 I/O BASE ADDRESS FOR EXTERNAL IO
 EZ80_MEM_CYCLES	.SET	2		; MEMORY BUS CYCLES (1-15) TO APPLY, IF EZ80_WSMD_TYP = EZ80WSMD_CYCLES
 EZ80_MEM_MIN_NS	.SET	100		; CALCULATE AT BOOT TIME THE REQUIRED W/S OR B/C, IF EZ80_WSMD_TYP = EZ80WSMD_CALC
 EZ80_MEM_WS	.SET	5		; MEMORY WAIT STATES (0-7) TO APPLY, IF EZ80_WSMD_TYP = EZ80WSMD_WAIT
-EZ80_MEM_MIN_WS	.SET	0		; MINIMUM WAIT STATES TO APPLY, IF EZ80_WSMD_TYP = EZ80WSMD_CALC
+EZ80_MEM_MIN_WS	.SET	1		; MINIMUM WAIT STATES TO APPLY, IF EZ80_WSMD_TYP = EZ80WSMD_CALC
 ;
 ; BUS TIMING FOR EXTERNAL I/O ACCESS (CS2)
 EZ80_IO_CYCLES	.SET	4		; IO BUS CYCLES (1-15) TO APPLY, IF EZ80_WSMD_TYP = EZ80WSMD_CYCLES