diff --git a/src/borg_hw/borg_hw_andreborg.c b/src/borg_hw/borg_hw_andreborg.c
index da86ed5..de1a1b6 100644
--- a/src/borg_hw/borg_hw_andreborg.c
+++ b/src/borg_hw/borg_hw_andreborg.c
@@ -26,7 +26,7 @@
 #	define TIMER0_INT_ENABLE() TIMSK0 |= _BV(OCIE0A)
 #	define TIMER0_ISR          TIMER0_COMPA_vect
 #else // ATmega16/32
-#	define TIMER0_OFF()        TIMSK0 &= ~(OCIE0); TCCR0 = 0
+#	define TIMER0_OFF()        TIMSK &= ~(OCIE0); TCCR0 = 0
 #	define TIMER0_CTC_CS256()  TCCR0 = _BV(WGM01) | _BV(CS02)
 #	define TIMER0_RESET()      TCNT0 = 0
 #	define TIMER0_COMPARE(t)   OCR0  = t
diff --git a/src/borg_hw/borg_hw_borg16.c b/src/borg_hw/borg_hw_borg16.c
index 2870c14..8cf6c76 100644
--- a/src/borg_hw/borg_hw_borg16.c
+++ b/src/borg_hw/borg_hw_borg16.c
@@ -48,7 +48,7 @@
 #	define TIMER0_INT_ENABLE() TIMSK0 |= _BV(OCIE0A)
 #	define TIMER0_ISR          TIMER0_COMPA_vect
 #else // ATmega16/32
-#	define TIMER0_OFF()        TIMSK0 &= ~(OCIE0); TCCR0 = 0
+#	define TIMER0_OFF()        TIMSK &= ~(OCIE0); TCCR0 = 0
 #	define TIMER0_CTC_CS256()  TCCR0 = _BV(WGM01) | _BV(CS02)
 #	define TIMER0_RESET()      TCNT0 = 0
 #	define TIMER0_COMPARE(t)   OCR0  = t