diff --git a/activemq-cpp/src/main/activemq/core/ActiveMQConsumer.cpp b/activemq-cpp/src/main/activemq/core/ActiveMQConsumer.cpp
index 751e9f77f..d85328136 100644
--- a/activemq-cpp/src/main/activemq/core/ActiveMQConsumer.cpp
+++ b/activemq-cpp/src/main/activemq/core/ActiveMQConsumer.cpp
@@ -547,7 +547,7 @@ void ActiveMQConsumer::deliverAcks()
             } else if( pendingAck != NULL &&
                        pendingAck->getAckType() == ActiveMQConstants::ACK_TYPE_CONSUMED ) {
 
-                ack = pendingAck;
+                ack.swap( pendingAck );
             }
 
             if( ack != NULL ) {