diff --git a/colab/plugins/data/base_importer.py b/colab/plugins/data/base_importer.py
index 443e400..e7d7f07 100644
--- a/colab/plugins/data/base_importer.py
+++ b/colab/plugins/data/base_importer.py
@@ -11,4 +11,9 @@ class PluginDataImporter(object):
 
     @abc.abstractmethod
     def fetch_data(self):
-        raise NotImplementedError('fetchData not yet implemented')
+        raise NotImplementedError
+    fetch_data.is_abstract = True
+
+    @abc.abstractmethod
+    def app_label(self):
+        raise NotImplementedError
diff --git a/colab/plugins/data/tasks.py b/colab/plugins/data/tasks.py
index cf2ef8a..9c65bdd 100644
--- a/colab/plugins/data/tasks.py
+++ b/colab/plugins/data/tasks.py
@@ -27,10 +27,10 @@ def register_tasks():
 
         for item_name in dir(module):
             item = getattr(module, item_name)
-            if item is PluginDataImporter:
-                continue
 
             if callable(getattr(item, 'fetch_data', None)):
+                if getattr(item.fetch_data, 'is_abstract', False):
+                    continue
                 instance = item()
                 task_name = '{}.{}'.format(module.__name__, item_name)
                 task = app.task(name=task_name, bind=True)(instance.fetch_data)
--
libgit2 0.21.2