diff --git a/Makefile b/Makefile
index fabc06f..914c106 100644
--- a/Makefile
+++ b/Makefile
@@ -11,6 +11,10 @@ ifdef BOARD
 include boards/$(BOARD).mk
 endif
 
+ifdef BAUDRATE
+CPPFLAGS += -DBAUDRATE=$(BAUDRATE)
+endif
+
 default: $(PROG).hex
 
 clean:
diff --git a/boards/nano.mk b/boards/nano.mk
index 6458dd4..bba1b2a 100644
--- a/boards/nano.mk
+++ b/boards/nano.mk
@@ -3,6 +3,8 @@ MCU_FREQ = 16000000UL
 
 CPPFLAGS += -DLED_DDR=DDRB -DLED_PORT=PORTB -DLED_PIN=5
 
+BAUDRATE = 56700
+
 AVRDUDE_TYPE = arduino
 AVRDUDE_TTY = /dev/ttyUSB0
-AVRDUDE_BAUD = 57600
+AVRDUDE_BAUD = 56700
diff --git a/boards/relaycard.mk b/boards/relaycard.mk
index 05f03f2..53f5f57 100644
--- a/boards/relaycard.mk
+++ b/boards/relaycard.mk
@@ -1,7 +1,5 @@
 include boards/nano.mk
 
-CPPFLAGS += -DBAUDRATE=$(AVRDUDE_BAUD)
-
 ifndef PROG
 PROG = relaycard
 endif