diff --git a/paramiko/sftp_file.py b/paramiko/sftp_file.py
index 17f999e..2887986 100644
--- a/paramiko/sftp_file.py
+++ b/paramiko/sftp_file.py
@@ -388,11 +388,9 @@ class SFTPFile (BufferedFile):
         ordered_chunks.sort(lambda x, y: cmp(x[0], y[0]))
         self._start_prefetch(ordered_chunks)
         # now we can just devolve to a bunch of read()s :)
-        out = []
         for x in chunks:
             self.seek(x[0])
-            out.append(self.read(x[1]))
-        return out
+            yield self.read(x[1])
     
 
     ###  internals...
diff --git a/tests/test_sftp_big.py b/tests/test_sftp_big.py
index aefe3ef..94edab0 100644
--- a/tests/test_sftp_big.py
+++ b/tests/test_sftp_big.py
@@ -232,7 +232,7 @@ class BigSFTPTest (unittest.TestCase):
                 for i in xrange(len(readv_list)):
                     offset = readv_list[i][0]
                     n_offset = offset % 1024
-                    self.assertEqual(ret[i], k2blob[n_offset:n_offset + chunk])
+                    self.assertEqual(ret.next(), k2blob[n_offset:n_offset + chunk])
                 f.close()
             end = time.time()
             sys.stderr.write('%ds ' % round(end - start))