diff --git a/Source/HBIOS/ay38910.asm b/Source/HBIOS/ay38910.asm
index 99743f68..91477135 100644
--- a/Source/HBIOS/ay38910.asm
+++ b/Source/HBIOS/ay38910.asm
@@ -553,7 +553,7 @@ AY_WRTPSG:
 	OUT0	(Z180_DCNTL),A		; AND RESTORE IT
 #ENDIF
 #IFDEF SBCV2004
-	LD	A,(RTCDEFVAL)		; SBC-V2-004 CHANGE TO
+	LD	A,(HB_RTCDEFVAL)		; SBC-V2-004 CHANGE TO
 	OUT	(RTCIO),A		; NORMAL CLOCK SPEED
 #ENDIF
 	JP	AY_EI
@@ -584,7 +584,7 @@ AY_RDPSG:
 	OUT0	(Z180_DCNTL),A		; AND RESTORE IT
 #ENDIF
 #IFDEF SBCV2004
-	LD	A,(RTCDEFVAL)		; SBC-V2-004 CHANGE TO
+	LD	A,(HB_RTCDEFVAL)		; SBC-V2-004 CHANGE TO
 	OUT	(RTCIO),A		; NORMAL CLOCK SPEED
 #ENDIF
 	JP	AY_EI