diff --git a/dspace-api/src/main/java/org/dspace/authenticate/LDAPAuthentication.java b/dspace-api/src/main/java/org/dspace/authenticate/LDAPAuthentication.java
index c6df4b30fa..9ca5245c54 100644
--- a/dspace-api/src/main/java/org/dspace/authenticate/LDAPAuthentication.java
+++ b/dspace-api/src/main/java/org/dspace/authenticate/LDAPAuthentication.java
@@ -17,6 +17,7 @@ import java.util.Collections;
 import java.util.Hashtable;
 import java.util.Iterator;
 import java.util.List;
+import java.util.Optional;
 import javax.naming.NamingEnumeration;
 import javax.naming.NamingException;
 import javax.naming.directory.Attribute;