diff --git a/app/chats/models.py b/app/chats/models.py
index 1ce60d6..964fbf9 100644
--- a/app/chats/models.py
+++ b/app/chats/models.py
@@ -34,7 +34,11 @@ class Chat(Base):
     created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now(), nullable=False)
 
     members: Mapped[list["ChatMember"]] = relationship(back_populates="chat", cascade="all, delete-orphan")
-    messages: Mapped[list["Message"]] = relationship(back_populates="chat", cascade="all, delete-orphan")
+    messages: Mapped[list["Message"]] = relationship(
+        back_populates="chat",
+        cascade="all, delete-orphan",
+        foreign_keys="Message.chat_id",
+    )
 
 
 class ChatMember(Base):
diff --git a/app/messages/models.py b/app/messages/models.py
index 8ab55bb..62ab673 100644
--- a/app/messages/models.py
+++ b/app/messages/models.py
@@ -49,7 +49,7 @@ class Message(Base):
         nullable=False,
     )
 
-    chat: Mapped["Chat"] = relationship(back_populates="messages")
+    chat: Mapped["Chat"] = relationship(back_populates="messages", foreign_keys=[chat_id])
     sender: Mapped["User"] = relationship(back_populates="sent_messages")
     attachments: Mapped[list["Attachment"]] = relationship(back_populates="message", cascade="all, delete-orphan")