diff --git a/tapeserver/castor/tape/tapeserver/daemon/DataTransferSessionTest.cpp b/tapeserver/castor/tape/tapeserver/daemon/DataTransferSessionTest.cpp
index 94db27be457103fe5ea0d3b55a1a070eece7f398..366f88e4460923b522c36bdb6a3de6300cff31a2 100644
--- a/tapeserver/castor/tape/tapeserver/daemon/DataTransferSessionTest.cpp
+++ b/tapeserver/castor/tape/tapeserver/daemon/DataTransferSessionTest.cpp
@@ -1260,7 +1260,7 @@ TEST_P(DataTransferSessionTest, DataTransferSessionGooddayMigration) {
       ar.requester.name = requester.username;
       ar.requester.group = "group";
       ar.fileSize = 1000;
-      ar.diskFileID = "x";
+      ar.diskFileID = std::to_string(fseq);
       ar.diskFileInfo.path = "y";
       ar.diskFileInfo.owner = "z";
       ar.diskFileInfo.group = "g";