diff --git a/Source/HBIOS/simrtc.asm b/Source/HBIOS/simrtc.asm
index 3a562f18..521b806d 100644
--- a/Source/HBIOS/simrtc.asm
+++ b/Source/HBIOS/simrtc.asm
@@ -55,7 +55,7 @@ SIMRTC_DISPATCH:
 	JP	Z,SIMRTC_SETALM	; SET ALARM 
 	DEC	A
 	JP	Z,SIMRTC_DEVICE	; REPORT RTC DEVICE INFO
-	SYSCHKERR(ERR_NOTFUNC)
+	SYSCHKERR(ERR_NOFUNC)
 	RET
 ;
 ; NVRAM FUNCTIONS ARE NOT AVAILABLE IN SIMULATOR