diff --git a/common/source/java/ch/systemsx/cisd/common/filesystem/FileUtilities.java b/common/source/java/ch/systemsx/cisd/common/filesystem/FileUtilities.java
index c521004353e9021631ed2960379366ffab4d7432..796dfa26e89846d5f03e72228aa5c6c41ef613a9 100644
--- a/common/source/java/ch/systemsx/cisd/common/filesystem/FileUtilities.java
+++ b/common/source/java/ch/systemsx/cisd/common/filesystem/FileUtilities.java
@@ -1414,7 +1414,7 @@ public final class FileUtilities
         long timestamp = System.currentTimeMillis();
         Date date = new Date(timestamp);
         DateFormat formatter = new SimpleDateFormat(DATE_FORMAT);
-        return formatter.format(date) + uniqueIncrement;
+        return formatter.format(date) + uniqueIncrement.incrementAndGet();
 
     }