diff --git a/ifxlookup/plugins/ldap.py b/ifxlookup/plugins/ldap.py
index 327bdb2..976ebd5 100644
--- a/ifxlookup/plugins/ldap.py
+++ b/ifxlookup/plugins/ldap.py
@@ -33,7 +33,7 @@ class ServiceDelegate(ServiceBase) :
 				scope = 'BASE'
 			if self._config['scope'].upper() in ['ONE','LEVEL'] :
 				scope = 'LEVEL'
-			self.connection.search(self._config['search_base'], '(' + self._config['filter_string'] + subject + ')', search_scope=scope,attributes=ldap3.ALL_ATTRIBUTES)
+			self.connection.search(self._config['search_base'], '(' + self._config['filter_string'] + subject.lower() + ')', search_scope=scope,attributes=ldap3.ALL_ATTRIBUTES)
 		except Exception as exception :
 			self.error.append('Problem with LDAP search: ' + exception)
 			return