diff --git a/osu.Game.Rulesets.Osu/Difficulty/OsuDifficultyCalculator.cs b/osu.Game.Rulesets.Osu/Difficulty/OsuDifficultyCalculator.cs
index fab3fa8425..75d9469da3 100644
--- a/osu.Game.Rulesets.Osu/Difficulty/OsuDifficultyCalculator.cs
+++ b/osu.Game.Rulesets.Osu/Difficulty/OsuDifficultyCalculator.cs
@@ -38,7 +38,7 @@ namespace osu.Game.Rulesets.Osu.Difficulty
             double aimRating = Math.Sqrt(skills[0].DifficultyValue()) * difficulty_multiplier;
             double aimRatingNoSliders = Math.Sqrt(skills[1].DifficultyValue()) * difficulty_multiplier;
             double speedRating = Math.Sqrt(skills[2].DifficultyValue()) * difficulty_multiplier;
-            double speedNotes = (skills[2] as Speed).RelevantNoteCount();
+            double speedNotes = ((Speed)skills[2]).RelevantNoteCount();
             double flashlightRating = Math.Sqrt(skills[3].DifficultyValue()) * difficulty_multiplier;
 
             double sliderFactor = aimRating > 0 ? aimRatingNoSliders / aimRating : 1;