diff --git a/storage/versioned/kv.go b/storage/versioned/kv.go
index cf0530d5f8bef0fcb6a173cbb43e9b78de9b7f72..13f05e82c7449282c669453eefbff1a6bb03ad46 100644
--- a/storage/versioned/kv.go
+++ b/storage/versioned/kv.go
@@ -167,6 +167,6 @@ func (v *KV) makeKey(key string, version uint64) string {
 
 // Exists returns false if the error indicates the element doesn't
 // exist.
-func (v *KV) Exists(err Error) bool {
+func (v *KV) Exists(err error) bool {
 	return ekv.Exists(err)
 }