diff --git a/osu.Game.Rulesets.Osu/Difficulty/OsuPerformanceCalculator.cs b/osu.Game.Rulesets.Osu/Difficulty/OsuPerformanceCalculator.cs
index c833defdd7..96281297d7 100644
--- a/osu.Game.Rulesets.Osu/Difficulty/OsuPerformanceCalculator.cs
+++ b/osu.Game.Rulesets.Osu/Difficulty/OsuPerformanceCalculator.cs
@@ -256,8 +256,8 @@ namespace osu.Game.Rulesets.Osu.Difficulty
             speedValue *= speedHighDeviationMultiplier;
 
             // An effective hit window is created based on the speed SR. The higher the speed difficulty, the shorter the hit window.
-            // For example, a speed SR of 3.0 leads to an effective hit window of 20ms, which is OD 10.
-            double effectiveHitWindow = Math.Sqrt(30 * 60 / attributes.SpeedDifficulty);
+            // For example, a speed SR of 4.0 leads to an effective hit window of 20ms, which is OD 10.
+            double effectiveHitWindow = 20 * Math.Pow(4 / attributes.SpeedDifficulty, 0.35);
 
             // Find the proportion of 300s on speed notes assuming the hit window was the effective hit window.
             double effectiveAccuracy = DifficultyCalculationUtils.Erf(effectiveHitWindow / (double)speedDeviation);