diff --git a/workspace_tools/build_release.py b/workspace_tools/build_release.py
index 73ee358007..822f97eada 100755
--- a/workspace_tools/build_release.py
+++ b/workspace_tools/build_release.py
@@ -87,6 +87,7 @@ OFFICIAL_MBED_LIBRARY_BUILD = (
     ('RBLAB_NRF51822', ('ARM', 'GCC_ARM')),
     ('RBLAB_BLENANO', ('ARM', 'GCC_ARM')),
     ('WALLBOT_BLE',  ('ARM', 'GCC_ARM')),
+    ('DELTA_DFCM_NNN40',  ('ARM', 'GCC_ARM')),
 
     ('LPC11U68',     ('ARM', 'uARM','GCC_ARM','GCC_CR', 'IAR')),
     ('OC_MBUINO',     ('ARM', 'uARM', 'GCC_ARM', 'IAR')),