diff --git a/acme/autocert/renewal.go b/acme/autocert/renewal.go
index 3b62b54..67876f9 100644
--- a/acme/autocert/renewal.go
+++ b/acme/autocert/renewal.go
@@ -5,9 +5,10 @@
 package autocert
 
 import (
-	"context"
 	"crypto"
 	"time"
+
+	"golang.org/x/net/context"
 )
 
 // maxRandRenew is a maximum deviation from Manager.RenewBefore.