diff --git a/Makefile b/Makefile
index 5724d4287..2e6f0eeed 100644
--- a/Makefile
+++ b/Makefile
@@ -23,6 +23,9 @@ OPTIONS		?=
 # Debugger optons, must be empty or GDB
 DEBUG ?=
 
+# Serial port/Device for flashing
+SERIAL_DEVICE	?= /dev/ttyUSB0
+
 ###############################################################################
 # Things that need to be maintained as the source changes
 #
@@ -193,9 +196,9 @@ clean:
 	rm -f $(TARGET_HEX) $(TARGET_ELF) $(TARGET_OBJS)
 
 flash_$(TARGET): $(TARGET_HEX)
-	stty -F /dev/ttyUSB0 raw speed 115200 -crtscts cs8 -parenb -cstopb -ixon
-	echo -n 'R' >/dev/ttyUSB0
-	stm32flash -w $(TARGET_HEX) -v -g 0x0 -b 115200 /dev/ttyUSB0
+	stty -F $(SERIAL_DEVICE) raw speed 115200 -crtscts cs8 -parenb -cstopb -ixon
+	echo -n 'R' >$(SERIAL_DEVICE)
+	stm32flash -w $(TARGET_HEX) -v -g 0x0 -b 115200 $(SERIAL_DEVICE)
 
 flash: flash_$(TARGET)