diff --git a/plugins/SliceInfoPlugin/SliceInfo.py b/plugins/SliceInfoPlugin/SliceInfo.py
index 51ba7fabf4..bce607c3fc 100644
--- a/plugins/SliceInfoPlugin/SliceInfo.py
+++ b/plugins/SliceInfoPlugin/SliceInfo.py
@@ -109,7 +109,6 @@ class SliceInfo(Extension):
             containers = { "": global_container_stack.serialize() }
             for container in global_container_stack.getContainers():
                 container_id = container.getId()
-                container_serialized = ""
                 try:
                     container_serialized = container.serialize()
                 except NotImplementedError: