diff --git a/osu.Game/Rulesets/Objects/Types/IHasDuration.cs b/osu.Game/Rulesets/Objects/Types/IHasDuration.cs
index b558273650..ca734da5ad 100644
--- a/osu.Game/Rulesets/Objects/Types/IHasDuration.cs
+++ b/osu.Game/Rulesets/Objects/Types/IHasDuration.cs
@@ -6,26 +6,16 @@ namespace osu.Game.Rulesets.Objects.Types
     /// <summary>
     /// A HitObject that ends at a different time than its start time.
     /// </summary>
-#pragma warning disable 618
-    public interface IHasDuration : IHasEndTime
-#pragma warning restore 618
+    public interface IHasDuration
     {
-        double IHasEndTime.EndTime
-        {
-            get => EndTime;
-            set => Duration = (Duration - EndTime) + value;
-        }
-
-        double IHasEndTime.Duration => Duration;
-
         /// <summary>
         /// The time at which the HitObject ends.
         /// </summary>
-        new double EndTime { get; }
+        double EndTime { get; }
 
         /// <summary>
         /// The duration of the HitObject.
         /// </summary>
-        new double Duration { get; set; }
+        double Duration { get; set; }
     }
 }
diff --git a/osu.Game/Rulesets/Objects/Types/IHasEndTime.cs b/osu.Game/Rulesets/Objects/Types/IHasEndTime.cs
deleted file mode 100644
index c3769c5909..0000000000
--- a/osu.Game/Rulesets/Objects/Types/IHasEndTime.cs
+++ /dev/null
@@ -1,26 +0,0 @@
-// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
-// See the LICENCE file in the repository root for full licence text.
-
-using System;
-using Newtonsoft.Json;
-
-namespace osu.Game.Rulesets.Objects.Types
-{
-    /// <summary>
-    /// A HitObject that ends at a different time than its start time.
-    /// </summary>
-    [Obsolete("Use IHasDuration instead.")] // can be removed 20201126
-    public interface IHasEndTime
-    {
-        /// <summary>
-        /// The time at which the HitObject ends.
-        /// </summary>
-        [JsonIgnore]
-        double EndTime { get; set; }
-
-        /// <summary>
-        /// The duration of the HitObject.
-        /// </summary>
-        double Duration { get; }
-    }
-}