diff --git a/qiniu/utils.py b/qiniu/utils.py
index 78eddcba..1b992fa9 100644
--- a/qiniu/utils.py
+++ b/qiniu/utils.py
@@ -151,4 +151,7 @@ def entry(bucket, key):
     Returns:
         符合七牛API规格的数据格式
     """
-    return urlsafe_base64_encode('{0}:{1}'.format(bucket, key))
+    if key is None:
+        return urlsafe_base64_encode('{0}'.format(bucket))
+    else:
+        return urlsafe_base64_encode('{0}:{1}'.format(bucket, key))
diff --git a/test_qiniu.py b/test_qiniu.py
index b8bf73e4..99655f69 100644
--- a/test_qiniu.py
+++ b/test_qiniu.py
@@ -125,6 +125,12 @@ def test_fetch(self):
         assert ret['key'] == 'fetch.html'
         assert ret['hash'] == 'FhwVT7vs6xqs1nu_vEdo_4x4qBMB'
 
+    def test_fetch_without_key(self):
+        ret, info = self.bucket.fetch('http://developer.qiniu.com/docs/v6/sdk/python-sdk.html', bucket_name)
+        print(info)
+        assert ret['key'] == 'FhwVT7vs6xqs1nu_vEdo_4x4qBMB'
+        assert ret['hash'] == 'FhwVT7vs6xqs1nu_vEdo_4x4qBMB'
+
     def test_stat(self):
         ret, info = self.bucket.stat(bucket_name, 'python-sdk.html')
         print(info)