diff --git a/osu.Game/Screens/Edit/Compose/Components/Timeline/Timeline.cs b/osu.Game/Screens/Edit/Compose/Components/Timeline/Timeline.cs
index 6ce5c06801..c1a16e2503 100644
--- a/osu.Game/Screens/Edit/Compose/Components/Timeline/Timeline.cs
+++ b/osu.Game/Screens/Edit/Compose/Components/Timeline/Timeline.cs
@@ -1,8 +1,6 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
-#nullable disable
-
 using System;
 using osu.Framework.Allocation;
 using osu.Framework.Audio.Track;
@@ -31,10 +29,10 @@ namespace osu.Game.Screens.Edit.Compose.Components.Timeline
         private readonly Drawable userContent;
 
         [Resolved]
-        private EditorClock editorClock { get; set; }
+        private EditorClock editorClock { get; set; } = null!;
 
         [Resolved]
-        private EditorBeatmap editorBeatmap { get; set; }
+        private EditorBeatmap editorBeatmap { get; set; } = null!;
 
         /// <summary>
         /// The timeline's scroll position in the last frame.
@@ -61,6 +59,22 @@ namespace osu.Game.Screens.Edit.Compose.Components.Timeline
         /// </summary>
         private float defaultTimelineZoom;
 
+        private WaveformGraph waveform = null!;
+
+        private TimelineTickDisplay ticks = null!;
+
+        private TimelineControlPointDisplay controlPoints = null!;
+
+        private Container mainContent = null!;
+
+        private Bindable<float> waveformOpacity = null!;
+        private Bindable<bool> controlPointsVisible = null!;
+        private Bindable<bool> ticksVisible = null!;
+
+        private double trackLengthForZoom;
+
+        private readonly IBindable<Track> track = new Bindable<Track>();
+
         public Timeline(Drawable userContent)
         {
             this.userContent = userContent;
@@ -73,22 +87,6 @@ namespace osu.Game.Screens.Edit.Compose.Components.Timeline
             ScrollbarVisible = false;
         }
 
-        private WaveformGraph waveform;
-
-        private TimelineTickDisplay ticks;
-
-        private TimelineControlPointDisplay controlPoints;
-
-        private Container mainContent;
-
-        private Bindable<float> waveformOpacity;
-        private Bindable<bool> controlPointsVisible;
-        private Bindable<bool> ticksVisible;
-
-        private double trackLengthForZoom;
-
-        private readonly IBindable<Track> track = new Bindable<Track>();
-
         [BackgroundDependencyLoader]
         private void load(IBindable<WorkingBeatmap> beatmap, OsuColour colours, OsuConfigManager config)
         {
@@ -318,7 +316,7 @@ namespace osu.Game.Screens.Edit.Compose.Components.Timeline
         }
 
         [Resolved]
-        private IBeatSnapProvider beatSnapProvider { get; set; }
+        private IBeatSnapProvider beatSnapProvider { get; set; } = null!;
 
         /// <summary>
         /// The total amount of time visible on the timeline.