diff -r f7154a8ec9eb -r b5131bd64de7 src/pyams_utils/adapter.py
--- a/src/pyams_utils/adapter.py	Tue Jun 23 13:02:10 2020 +0200
+++ b/src/pyams_utils/adapter.py	Tue Jun 23 13:02:59 2020 +0200
@@ -110,10 +110,12 @@
                 if provides is None:
                     raise TypeError("Missing 'provides' argument")
 
-            config = context.config.with_package(info.module)  # pylint: disable=no-member
             LOGGER.debug("Registering adapter %s for %s providing %s",
                          str(obj), str(adapts), str(provides))
-            registry = settings.get('registry', config.registry)
+            registry = settings.get('registry')
+            if registry is None:
+                config = context.config.with_package(info.module)  # pylint: disable=no-member
+                registry = config.registry
             registry.registerAdapter(obj, adapts, provides, settings.get('name', ''))
 
         info = self.venusian.attach(wrapped, callback, category='pyams_adapter',