diff --git a/osu.Game/Online/Multiplayer/ForceGameplayStartCountdown.cs b/osu.Game/Online/Multiplayer/ForceGameplayStartCountdown.cs
index 7f5c0f0a05..81ba56f35c 100644
--- a/osu.Game/Online/Multiplayer/ForceGameplayStartCountdown.cs
+++ b/osu.Game/Online/Multiplayer/ForceGameplayStartCountdown.cs
@@ -13,7 +13,8 @@ namespace osu.Game.Online.Multiplayer
     /// and forcing progression of any clients that are blocking load due to user interaction.
     /// </summary>
     [MessagePackObject]
-    public class ForceGameplayStartCountdown : MultiplayerCountdown
+    public sealed class ForceGameplayStartCountdown : MultiplayerCountdown
     {
+        public override bool IsExclusive => true;
     }
 }
diff --git a/osu.Game/Online/Multiplayer/MatchStartCountdown.cs b/osu.Game/Online/Multiplayer/MatchStartCountdown.cs
index 5d3365c947..b4c66e6f5b 100644
--- a/osu.Game/Online/Multiplayer/MatchStartCountdown.cs
+++ b/osu.Game/Online/Multiplayer/MatchStartCountdown.cs
@@ -9,7 +9,8 @@ namespace osu.Game.Online.Multiplayer
     /// A <see cref="MultiplayerCountdown"/> which will start the match after ending.
     /// </summary>
     [MessagePackObject]
-    public class MatchStartCountdown : MultiplayerCountdown
+    public sealed class MatchStartCountdown : MultiplayerCountdown
     {
+        public override bool IsExclusive => true;
     }
 }
diff --git a/osu.Game/Online/Multiplayer/MultiplayerCountdown.cs b/osu.Game/Online/Multiplayer/MultiplayerCountdown.cs
index 00bfa8919a..e8e2365f7b 100644
--- a/osu.Game/Online/Multiplayer/MultiplayerCountdown.cs
+++ b/osu.Game/Online/Multiplayer/MultiplayerCountdown.cs
@@ -29,5 +29,10 @@ namespace osu.Game.Online.Multiplayer
         /// </remarks>
         [Key(1)]
         public TimeSpan TimeRemaining { get; set; }
+
+        /// <summary>
+        /// Whether only a single instance of this <see cref="MultiplayerCountdown"/> type may be active at any one time.
+        /// </summary>
+        public virtual bool IsExclusive => false;
     }
 }