diff --git a/python/paddle/batch.py b/python/paddle/batch.py
index d48c54fcbb66487617b1946bc69724870c8f879c..3c6a53db3c2287e8ef5931a06ca5dad455665ee0 100644
--- a/python/paddle/batch.py
+++ b/python/paddle/batch.py
@@ -15,7 +15,7 @@
 __all__ = ['batch']
 
 
-def batch(reader, batch_size, drop_last=False):
+def batch(reader, batch_size, drop_last=True):
     """
     Create a batched reader.
 
diff --git a/python/paddle/v2/minibatch.py b/python/paddle/v2/minibatch.py
index d48c54fcbb66487617b1946bc69724870c8f879c..3c6a53db3c2287e8ef5931a06ca5dad455665ee0 100644
--- a/python/paddle/v2/minibatch.py
+++ b/python/paddle/v2/minibatch.py
@@ -15,7 +15,7 @@
 __all__ = ['batch']
 
 
-def batch(reader, batch_size, drop_last=False):
+def batch(reader, batch_size, drop_last=True):
     """
     Create a batched reader.