diff --git a/targets/TARGET_NORDIC/TARGET_NRF5x/TARGET_NRF52/CMakeLists.txt b/targets/TARGET_NORDIC/TARGET_NRF5x/TARGET_NRF52/CMakeLists.txt
index ac5e7c7c24..6297b6759d 100644
--- a/targets/TARGET_NORDIC/TARGET_NRF5x/TARGET_NRF52/CMakeLists.txt
+++ b/targets/TARGET_NORDIC/TARGET_NRF5x/TARGET_NRF52/CMakeLists.txt
@@ -28,6 +28,7 @@ target_sources(mbed-nrf52
         serial_api.c
         sleep.c
         spi_api.c
+        subtarget_init.c
         trng_api.c
         us_ticker.c
         watchdog_api.c
diff --git a/targets/TARGET_NORDIC/TARGET_NRF5x/TARGET_NRF52/TARGET_MCU_NRF52840/CMakeLists.txt b/targets/TARGET_NORDIC/TARGET_NRF5x/TARGET_NRF52/TARGET_MCU_NRF52840/CMakeLists.txt
index b6d375d0b8..7193d45848 100644
--- a/targets/TARGET_NORDIC/TARGET_NRF5x/TARGET_NRF52/TARGET_MCU_NRF52840/CMakeLists.txt
+++ b/targets/TARGET_NORDIC/TARGET_NRF5x/TARGET_NRF52/TARGET_MCU_NRF52840/CMakeLists.txt
@@ -25,6 +25,13 @@ target_include_directories(mbed-ep-atlas
         TARGET_EP_ATLAS
 )
 
+target_sources(mbed-ep-atlas
+    INTERFACE
+        TARGET_EP_ATLAS/ONBOARD_TELIT_ME310.cpp
+        TARGET_EP_ATLAS/usb_stdio.cpp
+        TARGET_EP_ATLAS/atlas_init.c
+)
+
 target_include_directories(mbed-nrf52840-dk
     INTERFACE
         TARGET_NRF52840_DK