diff --git a/amm/src/main/scala/ammonite/Main.scala b/amm/src/main/scala/ammonite/Main.scala
index a9867b030..f8677755f 100644
--- a/amm/src/main/scala/ammonite/Main.scala
+++ b/amm/src/main/scala/ammonite/Main.scala
@@ -301,7 +301,7 @@ object Main{
       case Right(cliConfig) =>
         if (cliConfig.core.bsp.value) {
           val buildServer = new AmmoniteBuildServer(
-            ???,
+            ammonite.compiler.CompilerBuilder,
             ammonite.compiler.Parsers,
             ammonite.compiler.DefaultCodeWrapper,
             initialScripts = cliConfig.rest.map(os.Path(_)),