diff --git a/project/Build.scala b/project/Build.scala
index 0f36d477649a..ed0e7fe8f537 100644
--- a/project/Build.scala
+++ b/project/Build.scala
@@ -838,7 +838,8 @@ object Build {
           extraClasspath ++= Seq(dottyCompiler, dottyInterfaces, asm, dottyStaging, dottyTastyInspector, tastyCore, compilerInterface)
         }
 
-        val fullArgs = main :: defaultOutputDirectory ::: (if (printTasty) args else insertClasspathInArgs(args, extraClasspath.mkString(File.pathSeparator)))
+        val wrappedArgs = (if (printTasty) args else insertClasspathInArgs(args, extraClasspath.mkString(File.pathSeparator))).map(arg => "\""+ arg + "\"")
+        val fullArgs = main :: defaultOutputDirectory ::: wrappedArgs
 
         (Compile / runMain).toTask(fullArgs.mkString(" ", " ", ""))
       }.evaluated,