diff --git a/targets/nrf51.json b/targets/nrf51.json
index 9959c6f79..f8870bc9a 100644
--- a/targets/nrf51.json
+++ b/targets/nrf51.json
@@ -14,5 +14,6 @@
 		"lib/nrfx/mdk/system_nrf51.c",
 		"src/device/nrf/nrf51.s"
 	],
+	"openocd-transport": "swd",
 	"openocd-target": "nrf51"
 }
diff --git a/targets/nrf52.json b/targets/nrf52.json
index 58f42c29e..765fee23f 100644
--- a/targets/nrf52.json
+++ b/targets/nrf52.json
@@ -12,5 +12,6 @@
 		"lib/nrfx/mdk/system_nrf52.c",
 		"src/device/nrf/nrf52.s"
 	],
+	"openocd-transport": "swd",
 	"openocd-target": "nrf51"
 }
diff --git a/targets/nrf52840.json b/targets/nrf52840.json
index 4ab30a208..c8470c655 100644
--- a/targets/nrf52840.json
+++ b/targets/nrf52840.json
@@ -12,5 +12,6 @@
 		"lib/nrfx/mdk/system_nrf52840.c",
 		"src/device/nrf/nrf52840.s"
 	],
+	"openocd-transport": "swd",
 	"openocd-target": "nrf51"
 }