diff --git a/python/src/trezorlib/cli/ble.py b/python/src/trezorlib/cli/ble.py
index 1a1411259..bef455f90 100644
--- a/python/src/trezorlib/cli/ble.py
+++ b/python/src/trezorlib/cli/ble.py
@@ -99,6 +99,7 @@ def disconnect_device(client: "TrezorClient") -> None:
         click.echo(f"Disconnect failed: {e}")
         sys.exit(3)
 
+
 @cli.command()
 @click.option("--device", is_flag=True, help="Disconnect from device side.")
 def disconnect(device: bool) -> None:
diff --git a/python/src/trezorlib/transport/ble.py b/python/src/trezorlib/transport/ble.py
index 54c24874f..a9da0f5e4 100644
--- a/python/src/trezorlib/transport/ble.py
+++ b/python/src/trezorlib/transport/ble.py
@@ -218,10 +218,14 @@ class BleAsync:
             return
         ble_device = self.devices[self.current]
         if ble_device.connected:
-            LOG.info("Disconnecting from %s (%s)..." % (ble_device.name, ble_device.address))
+            LOG.info(
+                "Disconnecting from %s (%s)..." % (ble_device.name, ble_device.address)
+            )
             await ble_device.disconnect()
         else:
-            LOG.info("Disconnected from %s (%s)." % (ble_device.name, ble_device.address))
+            LOG.info(
+                "Disconnected from %s (%s)." % (ble_device.name, ble_device.address)
+            )
         self.current = None
         self.rx = None
         self.tx = None