diff --git a/tests/data/slapd-unique.conf b/tests/data/slapd-unique.conf
index 8e069516e4..f2898b3ac9 100644
--- a/tests/data/slapd-unique.conf
+++ b/tests/data/slapd-unique.conf
@@ -48,6 +48,6 @@ rootpw		secret
 
 overlay			unique
 unique_ignore		o cn sn ou objectClass
-unique_attributes	employeeNumber
+unique_attributes	employeeNumber displayName
 
 #monitor#database	monitor
diff --git a/tests/scripts/test024-unique b/tests/scripts/test024-unique
index d14d6222bb..72ff91a94c 100755
--- a/tests/scripts/test024-unique
+++ b/tests/scripts/test024-unique
@@ -75,7 +75,9 @@ cn: dave
 businessCategory: otest
 carLicense: TEST
 departmentNumber: 42
-displayName: Dave
+# NOTE: use special chars in attr value to be used
+# in internal searches ITS#4212
+displayName: Dave (ITS#4212)
 employeeNumber: 69
 employeeType: contractor
 givenName: Dave