diff --git a/src/extension.js b/src/extension.js
index ebb98df..dd525d0 100644
--- a/src/extension.js
+++ b/src/extension.js
@@ -1249,7 +1249,7 @@ weather-storm.png = weather-storm-symbolic.svg
                 break;
 
             case WeatherPressureUnits.hPa:
-                pressure = pressure.toFixed(this._decimal_places);;
+                pressure = pressure.toFixed(this._decimal_places);
                 pressure_unit = "hPa";
                 break;
 
@@ -1448,7 +1448,7 @@ weather-storm.png = weather-storm-symbolic.svg
             if (this._connected)
                 this.parseWeatherCurrent();
             else
-                this.rebuildCurrentWeatherUi()
+                this.rebuildCurrentWeatherUi();
             return true;
         }));
     },
@@ -1580,7 +1580,7 @@ weather-storm.png = weather-storm-symbolic.svg
             if (this._connected)
                 this.parseWeatherForecast();
             else
-                this.rebuildFutureWeatherUi()
+                this.rebuildFutureWeatherUi();
             return true;
         }));
     },
diff --git a/src/prefs.js b/src/prefs.js
index 0d51665..fc6cdd0 100644
--- a/src/prefs.js
+++ b/src/prefs.js
@@ -112,7 +112,7 @@ const WeatherPrefsWidget = new GObject.Class({
 
         this.treeview.set_model(this.liststore);
 
-        let column = new Gtk.TreeViewColumn()
+        let column = new Gtk.TreeViewColumn();
         this.treeview.append_column(column);
 
         let renderer = new Gtk.CellRendererText();
@@ -304,7 +304,7 @@ const WeatherPrefsWidget = new GObject.Class({
         let entry = new Gtk.Entry();
         let completion = new Gtk.EntryCompletion();
         entry.set_completion(completion);
-        let completionModel = new Gtk.ListStore;
+        let completionModel = new Gtk.ListStore();
         completionModel.set_column_types([GObject.TYPE_STRING]);
         completion.set_model(completionModel);
         completion.set_text_column(0);