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diff --git a/kombu/transport/qpid.py b/kombu/transport/qpid.py
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index 2204624..35da356 100644
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--- a/kombu/transport/qpid.py
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+++ b/kombu/transport/qpid.py
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@@ -850,7 +850,7 @@ def basic_get(self, queue, no_ack=False, **kwargs):
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         except Empty:
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             pass
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-    def basic_ack(self, delivery_tag):
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+    def basic_ack(self, delivery_tag, multiple=False):
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         """Acknowledge a message by delivery_tag.
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         Acknowledges a message referenced by delivery_tag. Messages can
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@@ -864,8 +864,12 @@ def basic_ack(self, delivery_tag):
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         :param delivery_tag: The delivery tag associated with the message
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             to be acknowledged.
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         :type delivery_tag: uuid.UUID
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+        :param multiple: not implemented. If set to True an AssertionError
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+            is raised.
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+        :type multiple: bool
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         """
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+        assert multiple is False
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         self.qos.ack(delivery_tag)
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     def basic_reject(self, delivery_tag, requeue=False):