diff --git a/telegrambots-extensions/src/main/java/org/telegram/telegrambots/extensions/bots/commandbot/CommandBot.java b/telegrambots-extensions/src/main/java/org/telegram/telegrambots/extensions/bots/commandbot/CommandBot.java
index 29e3dd1f..1164aac2 100644
--- a/telegrambots-extensions/src/main/java/org/telegram/telegrambots/extensions/bots/commandbot/CommandBot.java
+++ b/telegrambots-extensions/src/main/java/org/telegram/telegrambots/extensions/bots/commandbot/CommandBot.java
@@ -24,7 +24,9 @@ public interface CommandBot {
      *
      * @param update Received update from Telegram
      */
-    void processInvalidCommandUpdate(Update update);
+    default void processInvalidCommandUpdate(Update update) {
+        processNonCommandUpdate(update);
+    }
 
     /**
      * Override this function in your bot implementation to filter messages with commands
@@ -39,5 +41,7 @@ public interface CommandBot {
      * false otherwise
      * @note Default implementation doesn't filter anything
      */
-    boolean filter(Message message);
+    default boolean filter(Message message) {
+        return false;
+    }
 }
diff --git a/telegrambots-extensions/src/main/java/org/telegram/telegrambots/extensions/bots/commandbot/TelegramLongPollingCommandBot.java b/telegrambots-extensions/src/main/java/org/telegram/telegrambots/extensions/bots/commandbot/TelegramLongPollingCommandBot.java
index 44e03c95..d55a4fe4 100644
--- a/telegrambots-extensions/src/main/java/org/telegram/telegrambots/extensions/bots/commandbot/TelegramLongPollingCommandBot.java
+++ b/telegrambots-extensions/src/main/java/org/telegram/telegrambots/extensions/bots/commandbot/TelegramLongPollingCommandBot.java
@@ -70,16 +70,6 @@ public abstract class TelegramLongPollingCommandBot extends TelegramLongPollingB
         processNonCommandUpdate(update);
     }
 
-    @Override
-    public void processInvalidCommandUpdate(Update update) {
-        processNonCommandUpdate(update);
-    }
-
-    @Override
-    public boolean filter(Message message) {
-        return false;
-    }
-
     @Override
     public final boolean register(IBotCommand botCommand) {
         return commandRegistry.register(botCommand);
diff --git a/telegrambots-extensions/src/main/java/org/telegram/telegrambots/extensions/bots/commandbot/TelegramWebhookCommandBot.java b/telegrambots-extensions/src/main/java/org/telegram/telegrambots/extensions/bots/commandbot/TelegramWebhookCommandBot.java
index 2b49e5e6..dcc37380 100644
--- a/telegrambots-extensions/src/main/java/org/telegram/telegrambots/extensions/bots/commandbot/TelegramWebhookCommandBot.java
+++ b/telegrambots-extensions/src/main/java/org/telegram/telegrambots/extensions/bots/commandbot/TelegramWebhookCommandBot.java
@@ -72,16 +72,6 @@ public abstract class TelegramWebhookCommandBot extends TelegramWebhookBot imple
         return null;
     }
 
-    @Override
-    public void processInvalidCommandUpdate(Update update) {
-        processNonCommandUpdate(update);
-    }
-
-    @Override
-    public boolean filter(Message message) {
-        return false;
-    }
-
     @Override
     public final boolean register(IBotCommand botCommand) {
         return commandRegistry.register(botCommand);
@@ -116,10 +106,4 @@ public abstract class TelegramWebhookCommandBot extends TelegramWebhookBot imple
     public final IBotCommand getRegisteredCommand(String commandIdentifier) {
         return commandRegistry.getRegisteredCommand(commandIdentifier);
     }
-
-    /**
-     * @return Bot username
-     */
-    @Override
-    public abstract String getBotUsername();
 }