diff --git a/osu.Game.Modes.Catch/CatchDifficultyCalculator.cs b/osu.Game.Modes.Catch/CatchDifficultyCalculator.cs
index c85cb8a8f1..53c6f5c2ce 100644
--- a/osu.Game.Modes.Catch/CatchDifficultyCalculator.cs
+++ b/osu.Game.Modes.Catch/CatchDifficultyCalculator.cs
@@ -4,7 +4,6 @@
 using osu.Game.Beatmaps;
 using osu.Game.Modes.Catch.Beatmaps;
 using osu.Game.Modes.Catch.Objects;
-using System;
 using System.Collections.Generic;
 
 namespace osu.Game.Modes.Catch