diff --git a/openbis/source/java/ch/systemsx/cisd/openbis/generic/server/task/DynamicPropertyEvaluationTriggeredByMaterialChangeMaintenanceTask.java b/openbis/source/java/ch/systemsx/cisd/openbis/generic/server/task/DynamicPropertyEvaluationTriggeredByMaterialChangeMaintenanceTask.java
index e83c7144e244993700affaaf0baa7884b45fefe4..56c12de42d0956d94a0619e32b6e4b399941c0e6 100644
--- a/openbis/source/java/ch/systemsx/cisd/openbis/generic/server/task/DynamicPropertyEvaluationTriggeredByMaterialChangeMaintenanceTask.java
+++ b/openbis/source/java/ch/systemsx/cisd/openbis/generic/server/task/DynamicPropertyEvaluationTriggeredByMaterialChangeMaintenanceTask.java
@@ -72,8 +72,6 @@ public class DynamicPropertyEvaluationTriggeredByMaterialChangeMaintenanceTask i
     static final String DEFAULT_TIMESTAMP_FILE = "../../../data/"
             + DynamicPropertyEvaluationTriggeredByMaterialChangeMaintenanceTask.class.getSimpleName() + "-timestamp.txt";
 
-    static final String CANCEL_IF_NO_TIMESTAMP_FILE_KEY = "cancel-if-no-timestamp-file";
-
     static final String INITIAL_TIMESTAMP_KEY = "initial-timestamp";
 
     private final ICommonServerForInternalUse server;