diff --git a/go/vt/mysqlctl/azblobbackupstorage/azblob.go b/go/vt/mysqlctl/azblobbackupstorage/azblob.go
index 5ec3827c778..cb77ef6153b 100644
--- a/go/vt/mysqlctl/azblobbackupstorage/azblob.go
+++ b/go/vt/mysqlctl/azblobbackupstorage/azblob.go
@@ -276,15 +276,20 @@ func (bs *AZBlobBackupStorage) containerURL() (*azblob.ContainerURL, error) {
 
 // ListBackups implements BackupStorage.
 func (bs *AZBlobBackupStorage) ListBackups(ctx context.Context, dir string) ([]backupstorage.BackupHandle, error) {
-	log.Infof("ListBackups: [azblob] container: %s, directory: %v", *containerName, objName(dir, ""))
+	var searchPrefix string
+	if dir == "/" {
+		searchPrefix = "/"
+	} else {
+		searchPrefix = objName(dir, "")
+	}
+
+	log.Infof("ListBackups: [azblob] container: %s, directory: %v", *containerName, searchPrefix)
 
 	containerURL, err := bs.containerURL()
 	if err != nil {
 		return nil, err
 	}
 
-	searchPrefix := objName(dir, "")
-
 	result := make([]backupstorage.BackupHandle, 0)
 	var subdirs []string
 
diff --git a/go/vt/mysqlctl/gcsbackupstorage/gcs.go b/go/vt/mysqlctl/gcsbackupstorage/gcs.go
index 7ca9f4796d6..1a7266a71ac 100644
--- a/go/vt/mysqlctl/gcsbackupstorage/gcs.go
+++ b/go/vt/mysqlctl/gcsbackupstorage/gcs.go
@@ -132,7 +132,14 @@ func (bs *GCSBackupStorage) ListBackups(ctx context.Context, dir string) ([]back
 
 	// List prefixes that begin with dir (i.e. list subdirs).
 	var subdirs []string
-	searchPrefix := objName(dir, "" /* include trailing slash */)
+
+	var searchPrefix string
+	if dir == "/" {
+		searchPrefix = ""
+	} else {
+		searchPrefix = objName(dir, "" /* include trailing slash */)
+	}
+
 	query := &storage.Query{
 		Delimiter: "/",
 		Prefix:    searchPrefix,