diff --git a/cli/command/system/dial_stdio.go b/cli/command/system/dial_stdio.go
index d4193ce8a..c8ccd181c 100644
--- a/cli/command/system/dial_stdio.go
+++ b/cli/command/system/dial_stdio.go
@@ -110,7 +110,7 @@ type nopCloseReader struct {
 	halfReadWriteCloser
 }
 
-func (x *nopCloseReader) CloseRead() error {
+func (*nopCloseReader) CloseRead() error {
 	return nil
 }