diff --git a/variants/arduino_zero/openocd_scripts/arduino_zero.cfg b/variants/arduino_zero/openocd_scripts/arduino_zero.cfg
index e6e03bb0a3318997ee6dc473d76316f96ad7fe11..af45443b7d24527132d77ff790d386ddb2929111 100644
--- a/variants/arduino_zero/openocd_scripts/arduino_zero.cfg
+++ b/variants/arduino_zero/openocd_scripts/arduino_zero.cfg
@@ -24,4 +24,7 @@ source [find interface/cmsis-dap.cfg]
 set CHIPNAME at91samd21g18
 set ENDIAN little
 
+# choose a port here
+set telnet_port 9876
+
 source [find target/at91samdXX.cfg]