diff --git a/boards/samr21-xpro/Makefile.include b/boards/samr21-xpro/Makefile.include
index 9610f28fa8255ed2387375c7ae79159f607f6f50..53046528781cc2cc45bffc6c620763221ae13f0a 100644
--- a/boards/samr21-xpro/Makefile.include
+++ b/boards/samr21-xpro/Makefile.include
@@ -4,6 +4,7 @@ export CPU_MODEL = samr21g18a
 
 # set default port depending on operating system
 PORT_LINUX ?= /dev/ttyACM0
+PORT_DARWIN ?= $(shell ls -1 /dev/tty.usbmodem* | head -n 1)
 
 # setup the boards dependencies
 include $(RIOTBOARD)/$(BOARD)/Makefile.dep