diff --git a/src/gluonnlp/data/stream.py b/src/gluonnlp/data/stream.py
index 25902d51ce..40c21c8747 100644
--- a/src/gluonnlp/data/stream.py
+++ b/src/gluonnlp/data/stream.py
@@ -202,7 +202,6 @@ def _get_sampler(self, sampler):
                          'a `gluon.data.Sampler`, but got %s'%(sampler))
 
     def __iter__(self):
-        file_sampler = self._get_sampler(self._file_sampler)
         # generate file samples
         for file_idx in iter(self._file_sampler):
             filename = self._files[file_idx]