diff --git a/bot_test.go b/bot_test.go
index 26c6f9a..cf490c0 100644
--- a/bot_test.go
+++ b/bot_test.go
@@ -317,7 +317,7 @@ func TestBotProcessUpdate(t *testing.T) {
 	b.ProcessUpdate(Update{Message: &Message{Text: "/start@other_bot"}})
 	b.ProcessUpdate(Update{Message: &Message{Text: "hello"}})
 	b.ProcessUpdate(Update{Message: &Message{Text: "text"}})
-	b.ProcessUpdate(Update{Message: &Message{PinnedMessage: &InaccessibleMessage{Message: &Message{}}}})
+	b.ProcessUpdate(Update{Message: &Message{PinnedMessage: &Message{}}})
 	b.ProcessUpdate(Update{Message: &Message{Photo: &Photo{}}})
 	b.ProcessUpdate(Update{Message: &Message{Voice: &Voice{}}})
 	b.ProcessUpdate(Update{Message: &Message{Audio: &Audio{}}})
@@ -342,7 +342,7 @@ func TestBotProcessUpdate(t *testing.T) {
 	b.ProcessUpdate(Update{Message: &Message{Chat: &Chat{ID: 1}, MigrateTo: 2}})
 	b.ProcessUpdate(Update{EditedMessage: &Message{Text: "edited"}})
 	b.ProcessUpdate(Update{ChannelPost: &Message{Text: "post"}})
-	b.ProcessUpdate(Update{ChannelPost: &Message{PinnedMessage: &InaccessibleMessage{Message: &Message{}}}})
+	b.ProcessUpdate(Update{ChannelPost: &Message{PinnedMessage: &Message{}}})
 	b.ProcessUpdate(Update{EditedChannelPost: &Message{Text: "edited post"}})
 	b.ProcessUpdate(Update{Callback: &Callback{MessageID: "inline", Data: "callback"}})
 	b.ProcessUpdate(Update{Callback: &Callback{Data: "callback"}})
diff --git a/callback.go b/callback.go
index e8619f0..bfd8a66 100644
--- a/callback.go
+++ b/callback.go
@@ -16,7 +16,7 @@ type Callback struct {
 
 	// Message will be set if the button that originated the query
 	// was attached to a message sent by a bot.
-	Message *InaccessibleMessage `json:"message"`
+	Message *Message `json:"message"`
 
 	// MessageID will be set if the button was attached to a message
 	// sent via the bot in inline mode.
diff --git a/context.go b/context.go
index df11373..f0ef1ff 100644
--- a/context.go
+++ b/context.go
@@ -201,12 +201,12 @@ func (c *nativeContext) Message() *Message {
 	case c.u.Message != nil:
 		return c.u.Message
 	case c.u.Callback != nil:
-		return c.u.Callback.Message.Message
+		return c.u.Callback.Message
 	case c.u.EditedMessage != nil:
 		return c.u.EditedMessage
 	case c.u.ChannelPost != nil:
 		if c.u.ChannelPost.PinnedMessage != nil {
-			return c.u.ChannelPost.PinnedMessage.Message
+			return c.u.ChannelPost.PinnedMessage
 		}
 		return c.u.ChannelPost
 	case c.u.EditedChannelPost != nil:
diff --git a/input_types.go b/input_types.go
index 8c33096..8e49a7f 100644
--- a/input_types.go
+++ b/input_types.go
@@ -17,7 +17,7 @@ type InputTextMessageContent struct {
 	ParseMode string `json:"parse_mode,omitempty"`
 
 	// (Optional) Link preview generation options for the message.
-	PreviewOptions *PreviewOptions `json:"link_preview_options"`
+	PreviewOptions *PreviewOptions `json:"link_preview_options,omitempty"`
 }
 
 func (input *InputTextMessageContent) IsInputMessageContent() bool {
diff --git a/message.go b/message.go
index 13f35a2..f2fc413 100644
--- a/message.go
+++ b/message.go
@@ -105,9 +105,9 @@ type Message struct {
 	// etc. that appear in the text.
 	Entities Entities `json:"entities,omitempty"`
 
-	// (Optional) ReactionOptions used for link preview generation for the message,
-	// if it is a text message and link preview options were changed
-	PreviewOptions PreviewOptions `json:"link_preview_options,omitempty"`
+	// (Optional) PreviewOptions used for link preview generation for the message,
+	// if it is a text message and link preview options were changed.
+	PreviewOptions *PreviewOptions `json:"link_preview_options,omitempty"`
 
 	// Some messages containing media, may as well have a caption.
 	Caption string `json:"caption,omitempty"`
@@ -137,7 +137,7 @@ type Message struct {
 	// For a video, information about it.
 	Video *Video `json:"video"`
 
-	// For a animation, information about it.
+	// For an animation, information about it.
 	Animation *Animation `json:"animation"`
 
 	// For a contact, contact information itself.
@@ -255,7 +255,7 @@ type Message struct {
 	// Specified message was pinned. Note that the Message object
 	// in this field will not contain further ReplyTo fields even
 	// if it is itself a reply.
-	PinnedMessage *InaccessibleMessage `json:"pinned_message"`
+	PinnedMessage *Message `json:"pinned_message"`
 
 	// Message is an invoice for a payment.
 	Invoice *Invoice `json:"invoice"`
@@ -380,7 +380,7 @@ const (
 	EntityBlockquote    EntityType = "blockquote"
 )
 
-// Entities is used to set message's text entities as a send option.
+// Entities are used to set message's text entities as a send option.
 type Entities []MessageEntity
 
 // ProximityAlert sent whenever a user in the chat triggers
@@ -396,6 +396,11 @@ type AutoDeleteTimer struct {
 	Unixtime int `json:"message_auto_delete_time"`
 }
 
+// Inaccessible shows whether the message is InaccessibleMessage object.
+func (m *Message) Inaccessible() bool {
+	return m.Sender == nil
+}
+
 // MessageSig satisfies Editable interface (see Editable.)
 func (m *Message) MessageSig() (string, int64) {
 	return strconv.Itoa(m.ID), m.Chat.ID
@@ -504,31 +509,6 @@ func (m *Message) Media() Media {
 	}
 }
 
-// InaccessibleMessage describes a message that was deleted or is otherwise
-// inaccessible to the bot. An instance of MaybeInaccessibleMessage object.
-type InaccessibleMessage struct {
-	// A message that can be inaccessible to the bot.
-	*Message
-
-	// Chat the message belonged to.
-	Chat *Chat `json:"chat"`
-
-	// Unique message identifier inside the chat.
-	MessageID int `json:"message_id"`
-
-	// Always 0. The field can be used to differentiate regular and
-	// inaccessible messages.
-	DateUnixtime int64 `json:"date"`
-}
-
-func (im *InaccessibleMessage) MessageSig() (string, int64) {
-	return strconv.Itoa(im.MessageID), im.Chat.ID
-}
-
-func (im *InaccessibleMessage) Time() time.Time {
-	return time.Unix(im.DateUnixtime, 0)
-}
-
 // MessageReaction object represents a change of a reaction on a message performed by a user.
 type MessageReaction struct {
 	// The chat containing the message the user reacted to.