diff --git a/testkit/src/mill/testkit/IntegrationTesterBase.scala b/testkit/src/mill/testkit/IntegrationTesterBase.scala
index 7e43e720e95..95f263c4f02 100644
--- a/testkit/src/mill/testkit/IntegrationTesterBase.scala
+++ b/testkit/src/mill/testkit/IntegrationTesterBase.scala
@@ -18,6 +18,7 @@ trait IntegrationTesterBase {
    */
   def initWorkspace(): Unit = {
     println(s"Copying integration test sources from $workspaceSourcePath to $workspacePath")
+    os.makeDir.all(workspacePath)
     os.list(workspacePath).foreach(os.remove.all(_))
     os.list(workspaceSourcePath).filter(_.last != out).foreach(os.copy.into(_, workspacePath))
     os.remove.all(workspacePath / "out")