diff --git a/osu.Game.Rulesets.Osu/Difficulty/Evaluators/ReadingEvaluator.cs b/osu.Game.Rulesets.Osu/Difficulty/Evaluators/ReadingEvaluator.cs
index 326e98609c..3363e2fbe0 100644
--- a/osu.Game.Rulesets.Osu/Difficulty/Evaluators/ReadingEvaluator.cs
+++ b/osu.Game.Rulesets.Osu/Difficulty/Evaluators/ReadingEvaluator.cs
@@ -131,7 +131,7 @@ namespace osu.Game.Rulesets.Osu.Difficulty.Evaluators
             var previousObj = (OsuDifficultyHitObject)currObj.Previous(0);
 
             // Buff perfect stacks only if current note is completely invisible at the time you click the previous note.
-            if (currObj.LazyJumpDistance == 0 && currObj.OpacityAt(previousObj.BaseObject.StartTime + previousObj.Preempt, true) == 0 && previousObj.StartTime + previousObj.Preempt > currObj.StartTime)
+            if (currObj.LazyJumpDistance == 0 && currObj.OpacityAt(previousObj.BaseObject.StartTime, true) == 0 && previousObj.StartTime > currObj.StartTime - currObj.Preempt)
                 hiddenDifficulty += hidden_multiplier * 2500 / Math.Pow(currObj.AdjustedDeltaTime, 1.5); // Perfect stacks are harder the less time between notes
 
             return hiddenDifficulty;