class StatsDProtocol(asyncio.DatagramProtocol):
     def __init__(self, data: bytes) -> None:
         self.data = data

-    def connection_made(
-        self, transport: asyncio.selector_events.BaseSelectorEventLoop
-    ) -> None:
-        transport.sendto(self.data)
+    def connection_made(self, transport: asyncio.transports.BaseTransport) -> None:
+        # supertype defines the argument type as "BaseTransport"
+        # BaseTransport has no sendto()
+        transport.sendto(self.data)  # type: ignore