diff --git a/telegrambots-abilities/src/main/java/org/telegram/abilitybots/api/db/BackupMap.java b/telegrambots-abilities/src/main/java/org/telegram/abilitybots/api/db/BackupMap.java
index 0f10f8eb..3647f511 100644
--- a/telegrambots-abilities/src/main/java/org/telegram/abilitybots/api/db/BackupMap.java
+++ b/telegrambots-abilities/src/main/java/org/telegram/abilitybots/api/db/BackupMap.java
@@ -4,7 +4,7 @@ import org.telegram.abilitybots.api.util.Pair;
 
 import java.util.*;
 
-public class BackupMap<K, V> extends AbstractCollection<Pair<K, V>> implements Collection<Pair<K, V>> {
+final class BackupMap<K, V> extends AbstractCollection<Pair<K, V>> implements Collection<Pair<K, V>> {
     private Collection<Pair<K, V>> entries = new HashSet<>();
 
     public BackupMap(){}
diff --git a/telegrambots-abilities/src/main/java/org/telegram/abilitybots/api/db/MapDBContext.java b/telegrambots-abilities/src/main/java/org/telegram/abilitybots/api/db/MapDBContext.java
index b6420fea..781d5b87 100644
--- a/telegrambots-abilities/src/main/java/org/telegram/abilitybots/api/db/MapDBContext.java
+++ b/telegrambots-abilities/src/main/java/org/telegram/abilitybots/api/db/MapDBContext.java
@@ -198,7 +198,7 @@ public class MapDBContext implements DBContext {
         Set entrySet = (Set) value;
         getSet(name).addAll(entrySet);
       } else if (value instanceof BackupMap) {
-        Map<Object, Object> entryMap = ((BackupMap)value).toMap();
+        Map<Object, Object> entryMap = ((BackupMap) value).toMap();
         getMap(name).putAll(entryMap);
       } else if (value instanceof List) {
         List entryList = (List) value;