diff --git a/datastore_server/sourceTest/java/ch/systemsx/cisd/openbis/dss/generic/server/DataStoreServiceTest.java b/datastore_server/sourceTest/java/ch/systemsx/cisd/openbis/dss/generic/server/DataStoreServiceTest.java
index f88246a57f3c43a126b86082e98d0b82f0c517d2..126f3a3a737cb031cde13ce5c13456865061a52a 100644
--- a/datastore_server/sourceTest/java/ch/systemsx/cisd/openbis/dss/generic/server/DataStoreServiceTest.java
+++ b/datastore_server/sourceTest/java/ch/systemsx/cisd/openbis/dss/generic/server/DataStoreServiceTest.java
@@ -117,10 +117,10 @@ public class DataStoreServiceTest extends AssertJUnit
         }
 
         @Override
-        public List<SequenceSearchResult> search(String sequenceSnippet, Map<String, String> optionalParameters)
+        public List<SequenceSearchResult> search(String sequenceSnippet, Map<String, String> optionalParametersOrNull)
         {
             assertSame(SEQUENCE_SNIPPET, sequenceSnippet);
-            assertSame(OPTIONAL_PARAMETERS, optionalParameters);
+            assertSame(OPTIONAL_PARAMETERS, optionalParametersOrNull);
             SequenceSearchResult sequenceSearchResult = new SequenceSearchResult();
             sequenceSearchResult.setDataSetCode(dataSetCode);
             return Arrays.asList(sequenceSearchResult);