diff --git a/osu.Game.Rulesets.Taiko/Beatmaps/TaikoBeatmapConverter.cs b/osu.Game.Rulesets.Taiko/Beatmaps/TaikoBeatmapConverter.cs
index 0784c94059..355ce1cf68 100644
--- a/osu.Game.Rulesets.Taiko/Beatmaps/TaikoBeatmapConverter.cs
+++ b/osu.Game.Rulesets.Taiko/Beatmaps/TaikoBeatmapConverter.cs
@@ -44,7 +44,7 @@ namespace osu.Game.Rulesets.Taiko.Beatmaps
         protected override Beatmap<TaikoHitObject> ConvertBeatmap(Beatmap original)
         {
             // Rewrite the beatmap info to add the slider velocity multiplier
-            BeatmapInfo info = original.BeatmapInfo.DeepClone<BeatmapInfo>();
+            BeatmapInfo info = original.BeatmapInfo.DeepClone();
             info.Difficulty.SliderMultiplier *= legacy_velocity_multiplier;
 
             Beatmap<TaikoHitObject> converted = base.ConvertBeatmap(original);
diff --git a/osu.Game/IO/Serialization/IJsonSerializable.cs b/osu.Game/IO/Serialization/IJsonSerializable.cs
index 33d0801e47..7dbc860979 100644
--- a/osu.Game/IO/Serialization/IJsonSerializable.cs
+++ b/osu.Game/IO/Serialization/IJsonSerializable.cs
@@ -16,12 +16,13 @@ namespace osu.Game.IO.Serialization
             return JsonConvert.SerializeObject(obj);
         }
 
-        public static T Deserialize<T>(string objString)
+        public static T Deserialize<T>(this string objString)
         {
             return JsonConvert.DeserializeObject<T>(objString);
         }
 
-        public static T DeepClone<T>(this IJsonSerializable obj)
+        public static T DeepClone<T>(this T obj)
+            where T : IJsonSerializable
         {
             return Deserialize<T>(Serialize(obj));
         }