diff --git a/client/transport.go b/client/transport.go
index f04e601649..6cd47f2efd 100644
--- a/client/transport.go
+++ b/client/transport.go
@@ -2,12 +2,9 @@ package client
 
 import (
 	"crypto/tls"
-	"errors"
 	"net/http"
 )
 
-var errTLSConfigUnavailable = errors.New("TLSConfig unavailable")
-
 // transportFunc allows us to inject a mock transport for testing. We define it
 // here so we can detect the tlsconfig and return nil for only this type.
 type transportFunc func(*http.Request) (*http.Response, error)