diff --git a/cpu/avr/dev/clock-avr.h b/cpu/avr/dev/clock-avr.h
index 02d175020..97a79ee23 100644
--- a/cpu/avr/dev/clock-avr.h
+++ b/cpu/avr/dev/clock-avr.h
@@ -130,7 +130,7 @@
 #elif F_CPU/CLOCK_CONF_SECOND < 256 * 8
   #define AVR_CONF_TMR0_PRESCALE 8
 #elif F_CPU/CLOCK_CONF_SECOND < 256 * 64
-  #define AVR_CONF_TMR0_PRESCALE 8
+  #define AVR_CONF_TMR0_PRESCALE 64
 #elif F_CPU/CLOCK_CONF_SECOND < 256 * 256
   #define AVR_CONF_TMR0_PRESCALE 256
 #else