diff --git a/cmd/docker/docker.go b/cmd/docker/docker.go
index b5cb621923..46a235c4bd 100644
--- a/cmd/docker/docker.go
+++ b/cmd/docker/docker.go
@@ -32,7 +32,7 @@ type errCtxSignalTerminated struct {
 	signal os.Signal
 }
 
-func (e errCtxSignalTerminated) Error() string {
+func (errCtxSignalTerminated) Error() string {
 	return ""
 }