diff --git a/screening/source/java/ch/systemsx/cisd/openbis/plugin/screening/shared/basic/dto/WellSearchCriteria.java b/screening/source/java/ch/systemsx/cisd/openbis/plugin/screening/shared/basic/dto/WellSearchCriteria.java
index 2bcd06311fb0317534b70624d8b15d8c7c848963..9a35e3cc2f1fd1f8d0419ccb5ae6e29727537c12 100644
--- a/screening/source/java/ch/systemsx/cisd/openbis/plugin/screening/shared/basic/dto/WellSearchCriteria.java
+++ b/screening/source/java/ch/systemsx/cisd/openbis/plugin/screening/shared/basic/dto/WellSearchCriteria.java
@@ -282,7 +282,7 @@ public class WellSearchCriteria implements ISerializable
         {
             if (isAllExperiments())
             {
-                return super.toString();
+                return "all experiments";
             } else
             {
                 return projectIdOrNull.toString();