diff --git a/.pytool/CISettings.py b/.pytool/CISettings.py
index e3f44add58..2fb99f2a17 100644
--- a/.pytool/CISettings.py
+++ b/.pytool/CISettings.py
@@ -195,6 +195,8 @@ class Settings(CiBuildSettingsManager, UpdateSettingsManager, SetupSettingsManag
             "RedfishPkg/Library/JsonLib/jansson", False))
         rs.append(RequiredSubmodule(
             "UnitTestFrameworkPkg/Library/SubhookLib/subhook", False))
+        rs.append(RequiredSubmodule(
+            "MdePkg/Library/BaseFdtLib/libfdt", False))
         return rs
 
     def GetName(self):