diff --git a/osu.Game/Online/Multiplayer/MatchRulesetRoomState.cs b/osu.Game/Online/Multiplayer/MatchRulesetRoomState.cs
index 773c9a55e8..105bb1c281 100644
--- a/osu.Game/Online/Multiplayer/MatchRulesetRoomState.cs
+++ b/osu.Game/Online/Multiplayer/MatchRulesetRoomState.cs
@@ -16,7 +16,7 @@ namespace osu.Game.Online.Multiplayer
     [Serializable]
     [MessagePackObject]
     [Union(0, typeof(TeamVsMatchRoomState))]
-    public abstract class MatchRulesetRoomState
+    public class MatchRulesetRoomState // TODO: this will need to be abstract or interface when/if we get messagepack working. for now it isn't as it breaks json serialisation.
     {
     }
 }
diff --git a/osu.Game/Online/Multiplayer/MatchRulesetUserState.cs b/osu.Game/Online/Multiplayer/MatchRulesetUserState.cs
index 36eae2447e..aa34cdab41 100644
--- a/osu.Game/Online/Multiplayer/MatchRulesetUserState.cs
+++ b/osu.Game/Online/Multiplayer/MatchRulesetUserState.cs
@@ -16,7 +16,7 @@ namespace osu.Game.Online.Multiplayer
     [Serializable]
     [MessagePackObject]
     [Union(0, typeof(TeamVsMatchUserState))]
-    public abstract class MatchRulesetUserState
+    public class MatchRulesetUserState // TODO: this will need to be abstract or interface when/if we get messagepack working. for now it isn't as it breaks json serialisation.
     {
     }
 }