diff --git a/CHANGELOG.md b/CHANGELOG.md
index 80cf84c579..02f12fabf9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,9 @@
 
 ## 0.25.0
 
+* `TelegramBotAPI`:
+    * `Bot` implementations (as and `Bot` itself) now have not nullable `username`
+
 ## 0.24.0
 
 * `TelegramBotAPI`:
diff --git a/TelegramBotAPI/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/User.kt b/TelegramBotAPI/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/User.kt
index d23a1ce1d0..8362b2cd42 100644
--- a/TelegramBotAPI/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/User.kt
+++ b/TelegramBotAPI/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/User.kt
@@ -22,17 +22,19 @@ data class CommonUser(
 ) : User()
 
 @Serializable(UserSerializer::class)
-sealed class Bot : User()
+sealed class Bot : User() {
+    abstract override val username: Username
+}
 
 @Serializable
 data class CommonBot(
     override val id: ChatId,
+    @SerialName(usernameField)
+    override val username: Username,
     @SerialName(firstNameField)
     override val firstName: String,
     @SerialName(lastNameField)
-    override val lastName: String = "",
-    @SerialName(usernameField)
-    override val username: Username? = null
+    override val lastName: String = ""
 ) : Bot() {
     @SerialName(isBotField)
     private val isBot = true
@@ -41,12 +43,12 @@ data class CommonBot(
 @Serializable
 data class ExtendedBot(
     override val id: ChatId,
+    @SerialName(usernameField)
+    override val username: Username,
     @SerialName(firstNameField)
     override val firstName: String,
     @SerialName(lastNameField)
     override val lastName: String = "",
-    @SerialName(usernameField)
-    override val username: Username? = null,
     @SerialName(canJoinGroupsField)
     val canJoinGroups: Boolean = false,
     @SerialName(canReadAllGroupMessagesField)