diff --git a/cpu/avr/dev/rs232_atmega128.h b/cpu/avr/dev/rs232_atmega128.h
index ea5081e93..ac9bb87f7 100644
--- a/cpu/avr/dev/rs232_atmega128.h
+++ b/cpu/avr/dev/rs232_atmega128.h
@@ -71,6 +71,21 @@
 #define USART_BAUD_250000 3
 #define USART_BAUD_500000 1
 #define USART_BAUD_1000000 0
+#elif MCU_MHZ == 8
+/* Single speed operation (U2X = 0)*/
+#define USART_BAUD_2400 207
+#define USART_BAUD_4800 103
+#define USART_BAUD_9600 51
+#define USART_BAUD_14400 34
+#define USART_BAUD_19200 25
+#define USART_BAUD_28800 16
+#define USART_BAUD_38400 12
+#define USART_BAUD_57600 8
+#define USART_BAUD_76800 6
+#define USART_BAUD_115200 3
+#define USART_BAUD_230400 1
+#define USART_BAUD_250000 1
+#define USART_BAUD_500000 0
 #else
 #error "Please define the baud rates for your CPU clock: ATmega128 handbook p. \
 195-198 or set the rate in contiki-conf.h"