diff --git a/debian/lib/python/debian_linux/config.py b/debian/lib/python/debian_linux/config.py
index 899915c2e..e2561906e 100644
--- a/debian/lib/python/debian_linux/config.py
+++ b/debian/lib/python/debian_linux/config.py
@@ -112,6 +112,7 @@ class ConfigCoreHierarchy(ConfigCore):
             'flavours': SchemaItemList(),
             'modules': SchemaItemBoolean(),
         },
+        'build': {},
         'image': {
             'configs': SchemaItemList(),
             'desc-parts': SchemaItemList(),