diff --git a/HellionChat/Ipc/TypingIpc.cs b/HellionChat/Ipc/TypingIpc.cs
index 474c8ff..33b6fd6 100644
--- a/HellionChat/Ipc/TypingIpc.cs
+++ b/HellionChat/Ipc/TypingIpc.cs
@@ -19,6 +19,17 @@ internal sealed class TypingIpc : IDisposable
     private ICallGateProvider<ChatInputState> StateQueryGate { get; }
     private ICallGateProvider<ChatInputState, object?> StateChangedGate { get; }
 
+    // v1.4.9 R4: ChatTwo IPC compatibility mirror. Some third-party plugins
+    // have a no-fork policy and subscribe only to ChatTwo.*-prefixed IPC
+    // gates. HellionChat replaces ChatTwo (conflict detection prevents
+    // parallel loading), so mirroring the ChatTwo provider slots lets those
+    // plugins keep working without code changes on their side. The tuple
+    // shape is textually identical to ChatTwo's IPC surface (same member
+    // order, same underlying types — ChatType is `ushort` in both repos)
+    // so Dalamud's IPC marshalling matches across plugin boundaries.
+    private ICallGateProvider<ChatInputState> ChatTwoStateQueryGate { get; }
+    private ICallGateProvider<ChatInputState, object?> ChatTwoStateChangedGate { get; }
+
     private ChatInputState LastState;
     private bool HasState;
 
@@ -33,7 +44,16 @@ internal sealed class TypingIpc : IDisposable
             "HellionChat.ChatInputStateChanged"
         );
 
+        // v1.4.9 R4: ChatTwo-prefixed compatibility slots (see class-level comment).
+        ChatTwoStateQueryGate = Plugin.Interface.GetIpcProvider<ChatInputState>(
+            "ChatTwo.GetChatInputState"
+        );
+        ChatTwoStateChangedGate = Plugin.Interface.GetIpcProvider<ChatInputState, object?>(
+            "ChatTwo.ChatInputStateChanged"
+        );
+
         StateQueryGate.RegisterFunc(GetState);
+        ChatTwoStateQueryGate.RegisterFunc(GetState);
     }
 
     private ChatInputState BuildState()
@@ -67,10 +87,13 @@ internal sealed class TypingIpc : IDisposable
         HasState = true;
         LastState = state;
         StateChangedGate.SendMessage(state);
+        // v1.4.9 R4: mirror on ChatTwo-prefixed slot for no-fork-policy plugins.
+        ChatTwoStateChangedGate.SendMessage(state);
     }
 
     public void Dispose()
     {
         StateQueryGate.UnregisterFunc();
+        ChatTwoStateQueryGate.UnregisterFunc();
     }
 }