diff --git a/openbis/sourceTest/java/ch/systemsx/cisd/openbis/generic/server/business/bo/ExperimentBOTest.java b/openbis/sourceTest/java/ch/systemsx/cisd/openbis/generic/server/business/bo/ExperimentBOTest.java
index 01cfe23e7c2e29bc7a3c3bb5468b99cebc8b8ab0..7944844286eb92a88902beb1b708424bfba9e0f6 100644
--- a/openbis/sourceTest/java/ch/systemsx/cisd/openbis/generic/server/business/bo/ExperimentBOTest.java
+++ b/openbis/sourceTest/java/ch/systemsx/cisd/openbis/generic/server/business/bo/ExperimentBOTest.java
@@ -748,7 +748,7 @@ public final class ExperimentBOTest extends AbstractBOTest
         context.assertIsSatisfied();
     }
 
-    @Test(expectedExceptionsMessageRegExp = "Sample 'S2' is already assigned.*", expectedExceptions = UserFailureException.class)
+    @Test(expectedExceptionsMessageRegExp = "Sample '/S2' is already assigned.*", expectedExceptions = UserFailureException.class)
     public void testUpdateByAddingAnAlreadyAssignedSample()
     {
         ExperimentIdentifier identifier = CommonTestUtils.createExperimentIdentifier();