diff --git a/service/src/main/java/lcsb/mapviewer/services/impl/UserService.java b/service/src/main/java/lcsb/mapviewer/services/impl/UserService.java
index 119bc9a9e0cd42ca16bcedb05e033f97a19e1125..3e45c9a29b950e75d0ff2287f0331a17e9f393ad 100644
--- a/service/src/main/java/lcsb/mapviewer/services/impl/UserService.java
+++ b/service/src/main/java/lcsb/mapviewer/services/impl/UserService.java
@@ -616,8 +616,9 @@ public class UserService implements IUserService {
       try {
         List<String> ldapUserNames = getLdapService().getUsernames();
         for (String string : ldapUserNames) {
-          if (result.keySet().contains(string)) {
-            result.put(string, true);
+          String ldapLogin = string.toLowerCase();
+          if (result.keySet().contains(ldapLogin)) {
+            result.put(ldapLogin, true);
           }
         }
       } catch (LDAPException e) {