diff --git a/frappy/io.py b/frappy/io.py
index 53de4bdd..5a59d7c3 100644
--- a/frappy/io.py
+++ b/frappy/io.py
@@ -63,6 +63,7 @@ class HasIO(Module):
                 io = self.ioClass(ioname, srv.log.getChild(ioname), opts, srv)  # pylint: disable=not-callable
                 io.callingModule = []
                 srv.modules[ioname] = io
+                srv.dispatcher.register_module(io, ioname)
                 self.ioDict[self.uri] = ioname
             self.io = ioname
 
diff --git a/frappy/playground.py b/frappy/playground.py
index c8b11f26..05647e7b 100644
--- a/frappy/playground.py
+++ b/frappy/playground.py
@@ -93,8 +93,9 @@ class Dispatcher(dispatcher.Dispatcher):
 
     def register_module(self, moduleobj, modulename, export=True):
         self.log.info('registering %s', modulename)
+        super().register_module(moduleobj, modulename, export)
         setattr(main, modulename, moduleobj)
-        self._modules[modulename] = moduleobj
+        self.get_module(modulename)
 
 
 logger = MainLogger()