diff --git a/Source/HBIOS/uart.asm b/Source/HBIOS/uart.asm
index c8e0b9b2..1aa6150a 100644
--- a/Source/HBIOS/uart.asm
+++ b/Source/HBIOS/uart.asm
@@ -78,11 +78,13 @@ UART1_IVT	.EQU	IVT(INT_UART1)
 ;
 ;
 UART_PREINIT:
+#IF (UART4)
 ;
 ; INIT UART4 BOARD CONFIG REGISTER (NO HARM IF IT IS NOT THERE)
 ;
 	LD	A,$80			; SELECT 7.3728MHZ OSC & LOCK CONFIG REGISTER
 	OUT	(UART4BASE+$0F),A	; DO IT
+#ENDIF
 ;
 ; SETUP THE DISPATCH TABLE ENTRIES
 ;