diff --git a/common/source/java/ch/systemsx/cisd/common/collection/QueuePersister.java b/common/source/java/ch/systemsx/cisd/common/collection/QueuePersister.java
index c8b4935847cb316478d44152fba47b0034eac2aa..b133446e6cb4350a76d2c53b352db92d4f92f819 100644
--- a/common/source/java/ch/systemsx/cisd/common/collection/QueuePersister.java
+++ b/common/source/java/ch/systemsx/cisd/common/collection/QueuePersister.java
@@ -34,7 +34,6 @@ import org.apache.log4j.Logger;
 import ch.systemsx.cisd.base.exceptions.CheckedExceptionTunnel;
 import ch.systemsx.cisd.base.exceptions.IOExceptionUnchecked;
 import ch.systemsx.cisd.common.collection.IQueuePersister;
-import ch.systemsx.cisd.common.collection.QueuePersister;
 import ch.systemsx.cisd.common.concurrent.ConcurrencyUtilities;
 import ch.systemsx.cisd.common.logging.LogCategory;
 import ch.systemsx.cisd.common.logging.LogFactory;