diff --git a/pitivi/elements/singledecodebin.py b/pitivi/elements/singledecodebin.py
index 3deede0d..7792d893 100644
--- a/pitivi/elements/singledecodebin.py
+++ b/pitivi/elements/singledecodebin.py
@@ -392,6 +392,7 @@ def _cleanUp(self):
             element.set_state(gst.STATE_NULL)
             self.remove(element)
         self._validelements = []
+        self._usedfactories = []
 
     ## Overrides