diff --git a/Knossos.NET/Classes/FsoBuild.cs b/Knossos.NET/Classes/FsoBuild.cs
index 09ea8b48..591ef4f1 100644
--- a/Knossos.NET/Classes/FsoBuild.cs
+++ b/Knossos.NET/Classes/FsoBuild.cs
@@ -409,7 +409,6 @@ public async Task<FsoResult> RunFSO(FsoExecType executableType, string cmdline,
                             if (!_flagErrorOneWarn)
                             {
                                 _flagErrorOneWarn = true;
-                                await Dispatcher.UIThread.InvokeAsync(async () => { await MessageBox.Show(MainWindow.instance, stderr, "Unable to run FSO", MessageBox.MessageBoxButtons.OK); });
                             }
                         }
                         return null;