diff --git a/tensorflow/python/ops/rnn.py b/tensorflow/python/ops/rnn.py
index 0af72231b00..3c225abbbfc 100644
--- a/tensorflow/python/ops/rnn.py
+++ b/tensorflow/python/ops/rnn.py
@@ -294,10 +294,6 @@ def _reverse_seq(input_seq, lengths):
     # Join into (time, batch_size, depth)
     s_joined = array_ops.stack(sequence)
 
-    # TODO(schuster, ebrevdo): Remove cast when reverse_sequence takes int32
-    if lengths is not None:
-      lengths = math_ops.to_int64(lengths)
-
     # Reverse along dimension 0
     s_reversed = array_ops.reverse_sequence(s_joined, lengths, 0, 1)
     # Split again into list