diff --git a/img/pool/rkey.go b/img/pool/rkey.go
index b089cf6..96126ce 100644
--- a/img/pool/rkey.go
+++ b/img/pool/rkey.go
@@ -4,7 +4,7 @@ import "time"
 
 const rkeykey = "__latest_rkey__"
 
-var rs *rkeystorage
+var rs rkeystorage
 
 func init() {
 	var err error