diff --git a/dataset/librispeech/librispeech.py b/dataset/librispeech/librispeech.py
index 32b8746c2..2d6f1763d 100644
--- a/dataset/librispeech/librispeech.py
+++ b/dataset/librispeech/librispeech.py
@@ -133,7 +133,7 @@ def create_manifest(data_dir, manifest_path):
 def prepare_dataset(url, md5sum, target_dir, manifest_path):
     """Download, unpack and create summmary manifest file.
     """
-    if not os.path.exists(os.path.join(target_dir)):
+    if not os.path.exists(os.path.join(target_dir, "LibriSpeech")):
         # download
         filepath = download(url, md5sum, target_dir)
         # unpack