diff --git a/wlauto/core/configuration.py b/wlauto/core/configuration.py
index 432e55ae..9564934b 100644
--- a/wlauto/core/configuration.py
+++ b/wlauto/core/configuration.py
@@ -668,7 +668,7 @@ class RunConfiguration(object):
         raw_list = self._raw_config.get(attr_name, [])
         for extname in raw_list:
             default_config = self.ext_loader.get_default_config(extname)
-            ext_config[extname] = self._raw_config.get(extname, default_config)
+            ext_config[extname] = self._raw_config.get(identifier(extname), default_config)
         list_name = '_global_{}'.format(attr_name)
         setattr(self, list_name, raw_list)
         setattr(self, attr_name, ext_config)