diff --git a/src/Filters/_FilterList.py b/src/Filters/_FilterList.py
index 36ad32c52..1cd8e67bc 100644
--- a/src/Filters/_FilterList.py
+++ b/src/Filters/_FilterList.py
@@ -37,18 +37,6 @@ import sys
 from Filters._FilterParser import FilterParser
 from gen.plug import BasePluginManager
 
-def flatten(mylist):
-    """
-    Flattens a nested list into a single list.
-    """
-    retval = []
-    for item in mylist:
-        if isinstance(item, (list, tuple)):
-            retval.extend(flatten(item))
-        else:
-            retval.append(item)
-    return retval
-
 PLUGMAN = BasePluginManager.get_instance()
 #-------------------------------------------------------------------------
 #
@@ -97,7 +85,7 @@ class FilterList(object):
                 import traceback
                 traceback.print_exc()
             filters += plugin_filters
-        return flatten(filters)
+        return filters
 
     def add(self, namespace, filt):
         assert(isinstance(namespace, basestring))