diff --git a/src/Avalonia.X11/ActivityTrackingHelper.cs b/src/Avalonia.X11/ActivityTrackingHelper.cs
index a3bfca5e90..846802d123 100644
--- a/src/Avalonia.X11/ActivityTrackingHelper.cs
+++ b/src/Avalonia.X11/ActivityTrackingHelper.cs
@@ -81,6 +81,7 @@ internal class WindowActivationTrackingHelper : IDisposable
     public void Dispose()
     {
         _platform.Globals.NetActiveWindowPropertyChanged -= OnNetActiveWindowChanged;
+        _platform.Globals.WindowActivationTrackingModeChanged -= OnWindowActivationTrackingModeChanged;
     }
 
     public void OnNetWmStateChanged(IntPtr[] atoms)
@@ -88,4 +89,4 @@ internal class WindowActivationTrackingHelper : IDisposable
         if (Mode == X11Globals.WindowActivationTrackingMode._NET_WM_STATE_FOCUSED)
             SetActive(atoms.Contains(_platform.Info.Atoms._NET_WM_STATE_FOCUSED));
     }
-}
\ No newline at end of file
+}