diff --git a/oss/gcsblob/gcs.go b/oss/gcsblob/gcs.go
index 0d8a531..6cbf082 100644
--- a/oss/gcsblob/gcs.go
+++ b/oss/gcsblob/gcs.go
@@ -104,6 +104,9 @@ func (g *GoogleCloudStorage) State(key string) (oss.OSSState, error) {
 }
 
 func (g *GoogleCloudStorage) List(prefix string) ([]oss.OSSPath, error) {
+	if !strings.HasSuffix(prefix, "/") {
+		prefix = prefix + "/"
+	}
 	ctx := context.Background()
 	it := g.client.Bucket(g.bucket).Objects(ctx, &storage.Query{
 		Prefix: prefix,