diff --git a/pkg/server/io/io.go b/pkg/server/io/io.go
index ba2af8039..259ae066d 100644
--- a/pkg/server/io/io.go
+++ b/pkg/server/io/io.go
@@ -333,7 +333,7 @@ func (c *ContainerIO) Attach(opts AttachOptions) error {
 		}
 		go attachStream(stdoutKey, close)
 	}
-	if opts.Tty && opts.Stderr != nil {
+	if !opts.Tty && opts.Stderr != nil {
 		wg.Add(1)
 		wc, close := cioutil.NewWriteCloseInformer(opts.Stderr)
 		if err := c.stderr.Add(stderrKey, wc); err != nil {