diff --git a/osu.Game/Screens/OnlinePlay/Multiplayer/Spectate/CatchUpSpectatorPlayerClock.cs b/osu.Game/Screens/OnlinePlay/Multiplayer/Spectate/CatchUpSpectatorPlayerClock.cs
index 93e1ea3c24..8d8f6a373a 100644
--- a/osu.Game/Screens/OnlinePlay/Multiplayer/Spectate/CatchUpSpectatorPlayerClock.cs
+++ b/osu.Game/Screens/OnlinePlay/Multiplayer/Spectate/CatchUpSpectatorPlayerClock.cs
@@ -17,7 +17,7 @@ namespace osu.Game.Screens.OnlinePlay.Multiplayer.Spectate
         /// </summary>
         public const double CATCHUP_RATE = 2;
 
-        public IFrameBasedClock Source { get; set; }
+        public readonly IFrameBasedClock Source;
 
         public double CurrentTime { get; private set; }
 
diff --git a/osu.Game/Screens/OnlinePlay/Multiplayer/Spectate/ISpectatorPlayerClock.cs b/osu.Game/Screens/OnlinePlay/Multiplayer/Spectate/ISpectatorPlayerClock.cs
index b2ecb105c2..a2e6df9282 100644
--- a/osu.Game/Screens/OnlinePlay/Multiplayer/Spectate/ISpectatorPlayerClock.cs
+++ b/osu.Game/Screens/OnlinePlay/Multiplayer/Spectate/ISpectatorPlayerClock.cs
@@ -33,10 +33,5 @@ namespace osu.Game.Screens.OnlinePlay.Multiplayer.Spectate
         /// Of note, this will be false if this clock is *ahead* of the master clock.
         /// </remarks>
         bool IsCatchingUp { get; set; }
-
-        /// <summary>
-        /// The source clock
-        /// </summary>
-        IFrameBasedClock Source { set; }
     }
 }