diff --git a/src/main/java/net/frozenorb/apiv3/model/User.java b/src/main/java/net/frozenorb/apiv3/model/User.java
index abae471..5be55c7 100644
--- a/src/main/java/net/frozenorb/apiv3/model/User.java
+++ b/src/main/java/net/frozenorb/apiv3/model/User.java
@@ -150,7 +150,7 @@ public final class User {
 	}
 
     public static void findByLastUsernameLower(String lastUsernameLower, SingleResultCallback<User> callback) {
-        usersCollection.find(new Document("lastUsernameLower", lastUsernameLower)).first(SyncUtils.vertxWrap(callback));
+        usersCollection.find(new Document("lastUsernameLower", lastUsernameLower.toLowerCase())).first(SyncUtils.vertxWrap(callback));
     }
 
 	public static void findOrCreateByIdGrouped(Map<UUID, String> search, SingleResultCallback<Map<UUID, User>> callback) {