diff --git a/pyrogram/connection/transport/tcp/__init__.py b/pyrogram/connection/transport/tcp/__init__.py
index d1daff63..f6b85c25 100644
--- a/pyrogram/connection/transport/tcp/__init__.py
+++ b/pyrogram/connection/transport/tcp/__init__.py
@@ -17,5 +17,6 @@
 # along with Pyrogram.  If not, see <http://www.gnu.org/licenses/>.
 
 from .tcp_abridged import TCPAbridged
+from .tcp_abridged_o import TCPAbridgedO
 from .tcp_full import TCPFull
 from .tcp_intermediate import TCPIntermediate