diff --git a/openfm_qt/__init__.py b/openfm_qt/__init__.py
index b2f385b..6ea43af 100644
--- a/openfm_qt/__init__.py
+++ b/openfm_qt/__init__.py
@@ -1,7 +1,9 @@
-# This Python file uses the following encoding: utf-8
+# coding=utf-8
 
 API_URL = "https://open.fm/radio/api/v2/ofm/stations_slug.json"
 DEFAULT_VOLUME = 70
 
-from .ui_main_window import Ui_MainWindow
-from .mainwindow import MainWindow
+from .ui_main_window import Ui_MainWindow  # nopep8: E402
+from .mainwindow import MainWindow  # nopep8: E402
+
+__all__ = [Ui_MainWindow, MainWindow]
diff --git a/openfm_qt/mainwindow.py b/openfm_qt/mainwindow.py
index d988db2..82f0d9b 100644
--- a/openfm_qt/mainwindow.py
+++ b/openfm_qt/mainwindow.py
@@ -1,4 +1,4 @@
-# This Python file uses the following encoding: utf-8
+# coding=utf-8
 
 from PySide6.QtCore import QUrl
 from PySide6.QtWidgets import QMainWindow, QMessageBox, QStyle
@@ -51,8 +51,7 @@ class MainWindow(QMainWindow):
     def printGroups(self) -> None:
         """Print groups (categories) in groupsListWidget."""
         self.ui.groupsListWidget.addItems(
-            [e["name"] for e in self.__stations_data["groups"]]
-        )
+            [e["name"] for e in self.__stations_data["groups"]])
 
     def printStations(self) -> None:
         """Print stations (channels) in stationsListWidget."""
@@ -63,13 +62,10 @@ class MainWindow(QMainWindow):
                 group_id = e["id"]
 
         self.ui.stationsListWidget.clear()
-        self.ui.stationsListWidget.addItems(
-            [
-                e["name"]
-                for e in self.__stations_data["channels"]
-                if e["group_id"] == group_id
-            ]
-        )
+        self.ui.stationsListWidget.addItems([
+            e["name"] for e in self.__stations_data["channels"]
+            if e["group_id"] == group_id
+        ])
 
     def setVolume(self, volume: int = None) -> None:
         """Set playback volume to given number or slider value."""
diff --git a/prebuild.py b/prebuild.py
index b12c893..edcc661 100644
--- a/prebuild.py
+++ b/prebuild.py
@@ -1,4 +1,4 @@
-# This Python file uses the following encoding: utf-8
+# coding=utf-8
 
 import sys
 import os