diff --git a/avr/modules/basetimer/main.asm b/avr/modules/basetimer/main.asm
index e4bb851..7b83e17 100644
--- a/avr/modules/basetimer/main.asm
+++ b/avr/modules/basetimer/main.asm
@@ -88,11 +88,18 @@ BaseTimer_Init:            ; setup timer for IRQ every 100ms
 
 
   ldi r16, (1<<OCF0A)             ; clear pending interrupts
+.ifdef TIFR0
   out TIFR0, r16
+.else
+  out TIFR, r16
+.endif
   
   ldi r16, (1<<OCIE0A)            ; Timer/Counter0 Output Compare Match A Interrupt Enable
+.ifdef TIMSK0
   out TIMSK0, r16
-
+.else
+  out TIMSK, r16
+.endif
   sec
   ret
 ; @end