diff --git a/boards/holybro/durandal-v1/default.cmake b/boards/holybro/durandal-v1/default.cmake
index a049d2d35e..5ed6811702 100644
--- a/boards/holybro/durandal-v1/default.cmake
+++ b/boards/holybro/durandal-v1/default.cmake
@@ -15,6 +15,7 @@ px4_add_board(
 		GPS1:/dev/ttyS0
 		TEL1:/dev/ttyS1
 		TEL2:/dev/ttyS2
+		TEL3:/dev/ttyS4
 		TEL4:/dev/ttyS3
 	DRIVERS
 		adc/board_adc