diff --git a/Source/HBIOS/hbios.asm b/Source/HBIOS/hbios.asm
index 241f5c92..d640c3ed 100644
--- a/Source/HBIOS/hbios.asm
+++ b/Source/HBIOS/hbios.asm
@@ -3504,7 +3504,7 @@ HB_DSKFN:
 HB_DSKFNADR	.EQU	$+1
 	CALL	PANIC			; READ ONE SECTOR
 #IF (DIAGENABLE & DIAGDISKIO)
-	DIAG(DIAG00)				; CLEAR DIAG LEDS
+	DIAG(DIAG_00)				; CLEAR DIAG LEDS
 #ENDIF
 #IF (LEDENABLE & LEDDISKIO)
 	LED($00)
diff --git a/Source/HBIOS/hbios.inc b/Source/HBIOS/hbios.inc
index 1931e1db..d0d59a42 100644
--- a/Source/HBIOS/hbios.inc
+++ b/Source/HBIOS/hbios.inc
@@ -175,8 +175,8 @@ DIAG_02 .EQU 00000011B
 DIAG_03 .EQU 00000111B 
 DIAG_04 .EQU 00001111B 
 DIAG_05 .EQU 00011111B 
-DIAG_06 .EQU 01111111B 
-DIAG_07 .EQU 11111111B 
+DIAG_06 .EQU 00111111B 
+DIAG_07 .EQU 01111111B 
 DIAG_08 .EQU 11111111B 
 DIAG_09 .EQU 11111111B   
 #ENDIF