diff --git a/crates/teloxide-core/src/types/business_connection_id.rs b/crates/teloxide-core/src/types/business_connection_id.rs
index 982a3f66..672caddf 100644
--- a/crates/teloxide-core/src/types/business_connection_id.rs
+++ b/crates/teloxide-core/src/types/business_connection_id.rs
@@ -2,33 +2,15 @@ use serde::{Deserialize, Serialize};
 
 /// A unique business connection identifier.
 #[derive(Default, Clone, Debug, derive_more::Display, PartialEq, Eq, Hash, Serialize, Deserialize)]
-#[serde(from = "BusinessConnectionIdRaw", into = "BusinessConnectionIdRaw")]
 pub struct BusinessConnectionId(pub String);
 
-#[derive(Serialize, Deserialize)]
-struct BusinessConnectionIdRaw {
-    business_connection_id: String,
-}
-
-impl From<BusinessConnectionIdRaw> for BusinessConnectionId {
-    fn from(BusinessConnectionIdRaw { business_connection_id }: BusinessConnectionIdRaw) -> Self {
-        BusinessConnectionId(business_connection_id)
-    }
-}
-
-impl From<BusinessConnectionId> for BusinessConnectionIdRaw {
-    fn from(BusinessConnectionId(business_connection_id): BusinessConnectionId) -> Self {
-        BusinessConnectionIdRaw { business_connection_id }
-    }
-}
-
 #[cfg(test)]
 mod tests {
     use crate::types::BusinessConnectionId;
 
     #[test]
     fn business_connection_id_deser() {
-        let json = r#"{"business_connection_id": "abcd1234"}"#;
+        let json = r#""abcd1234""#;
         let bcid: BusinessConnectionId = serde_json::from_str(json).unwrap();
         assert_eq!(bcid, BusinessConnectionId(String::from("abcd1234")));
     }
@@ -37,6 +19,6 @@ mod tests {
     fn business_connection_id_ser() {
         let bcid: BusinessConnectionId = BusinessConnectionId(String::from("abcd1234"));
         let json = serde_json::to_string(&bcid).unwrap();
-        assert_eq!(json, r#"{"business_connection_id":"abcd1234"}"#);
+        assert_eq!(json, r#""abcd1234""#);
     }
 }
diff --git a/crates/teloxide-core/src/types/business_messages_deleted.rs b/crates/teloxide-core/src/types/business_messages_deleted.rs
index 3c84daea..ec5a6b4d 100644
--- a/crates/teloxide-core/src/types/business_messages_deleted.rs
+++ b/crates/teloxide-core/src/types/business_messages_deleted.rs
@@ -7,6 +7,7 @@ use crate::types::{BusinessConnectionId, Chat, MessageId};
 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
 pub struct BusinessMessagesDeleted {
     /// Unique identifier of the business connection.
+    #[serde(flatten)]
     pub business_connection_id: BusinessConnectionId,
 
     /// Information about a chat in the business account. The bot may not have
diff --git a/crates/teloxide-core/src/types/message.rs b/crates/teloxide-core/src/types/message.rs
index 2b2ce6e2..95a6d615 100644
--- a/crates/teloxide-core/src/types/message.rs
+++ b/crates/teloxide-core/src/types/message.rs
@@ -169,6 +169,7 @@ pub struct MessageCommon {
     /// received. If non-empty, the message belongs to a chat of the
     /// corresponding business account that is independent from any potential
     /// bot chat which might share the same identifier.
+    #[serde(flatten)]
     pub business_connection_id: Option<BusinessConnectionId>,
 }
 
diff --git a/crates/teloxide-core/src/types/update.rs b/crates/teloxide-core/src/types/update.rs
index b6707c2b..dd06de27 100644
--- a/crates/teloxide-core/src/types/update.rs
+++ b/crates/teloxide-core/src/types/update.rs
@@ -1007,7 +1007,7 @@ mod test {
         "#;
         let chat = Chat {
             id: ChatId(-1002199793788),
-            kind: ChatKind::Public(ChatPublic {
+            kind: ChatKind::Public(Box::new(ChatPublic {
                 title: Some("тест".to_owned()),
                 kind: PublicChatKind::Supergroup(PublicChatSupergroup {
                     username: None,
@@ -1027,7 +1027,7 @@ mod test {
                 description: None,
                 invite_link: None,
                 has_protected_content: None,
-            }),
+            })),
             photo: None,
             available_reactions: None,
             pinned_message: None,