diff --git a/src/gbulb/transports.py b/src/gbulb/transports.py
index 1d31d78..ac5ee9b 100644
--- a/src/gbulb/transports.py
+++ b/src/gbulb/transports.py
@@ -105,8 +105,7 @@ def __init__(self, *args, **kwargs):
         self._loop.call_soon(self._loop_reading)
 
     def set_protocol(self, protocol):
-        if hasattr(asyncio, "BufferedProtocol"):  # Python 3.7+
-            self._alloc_read_buffers = isinstance(protocol, asyncio.BufferedProtocol)
+        self._alloc_read_buffers = isinstance(protocol, asyncio.BufferedProtocol)
         super().set_protocol(protocol)
 
     def pause_reading(self):