diff --git a/python_apps/media-monitor2/media/monitor/pure.py b/python_apps/media-monitor2/media/monitor/pure.py
index 5329df165..77a725941 100644
--- a/python_apps/media-monitor2/media/monitor/pure.py
+++ b/python_apps/media-monitor2/media/monitor/pure.py
@@ -496,7 +496,7 @@ def toposort(data):
     for k, v in data.items():
         v.discard(k) # Ignore self dependencies
     extra_items_in_deps = reduce(set.union, data.values()) - set(data.keys())
-    data.update({item:set() for item in extra_items_in_deps})
+    data.update(dict((item,set()) for item in extra_items_in_deps))
     while True:
         ordered = set(item for item,dep in data.items() if not dep)
         if not ordered: break