diff --git a/main.go b/main.go
index 2595a83..79ef4df 100644
--- a/main.go
+++ b/main.go
@@ -334,10 +334,10 @@ func (gf *GarageFile) readDirRoot(count int) ([]fs.FileInfo, error) {
 }
 
 func (gf *GarageFile) readDirChild(count int) ([]fs.FileInfo, error) {
-  prefix := gf.path.key
-  if prefix[len(prefix)-1:] != "/" {
-    prefix = prefix + "/"
-  }
+	prefix := gf.path.key
+	if len(prefix) > 0 && prefix[len(prefix)-1:] != "/" {
+		prefix = prefix + "/"
+	}
 
 	objs_info := gf.mc.ListObjects(gf.ctx, gf.path.bucket, minio.ListObjectsOptions{
 		Prefix:    prefix,