diff --git a/osu.Game.Rulesets.Taiko/Difficulty/Preprocessing/TaikoDifficultyHitObjectColour.cs b/osu.Game.Rulesets.Taiko/Difficulty/Preprocessing/TaikoDifficultyHitObjectColour.cs
index 8be803fd05..8304c0b126 100644
--- a/osu.Game.Rulesets.Taiko/Difficulty/Preprocessing/TaikoDifficultyHitObjectColour.cs
+++ b/osu.Game.Rulesets.Taiko/Difficulty/Preprocessing/TaikoDifficultyHitObjectColour.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 
 namespace osu.Game.Rulesets.Taiko.Difficulty.Preprocessing