diff --git a/src/Lean/Server/FileWorker.lean b/src/Lean/Server/FileWorker.lean
index 2ee0c9e1ba..281a01939d 100644
--- a/src/Lean/Server/FileWorker.lean
+++ b/src/Lean/Server/FileWorker.lean
@@ -326,7 +326,7 @@ def setupImports (meta : DocumentMeta) (cmdlineOpts : Options) (chanOut : Std.Ch
   let opts := cmdlineOpts.mergeBy (fun _ _ fileOpt => fileOpt) fileSetupResult.fileOptions
 
   -- default to async elaboration; see also `Elab.async` docs
-  let opts := Elab.async.setIfNotSet opts true
+  --let opts := Elab.async.setIfNotSet opts true
 
   return .ok {
     mainModuleName