diff --git a/example/warpctc/lstm.py b/example/warpctc/lstm.py
index 97fda6b9c9d4..32ba2455e11d 100644
--- a/example/warpctc/lstm.py
+++ b/example/warpctc/lstm.py
@@ -72,7 +72,7 @@ def lstm_unroll(num_lstm_layer, seq_len,
     hidden_concat = mx.sym.Concat(*hidden_all, dim=0)
     pred = mx.sym.FullyConnected(data=hidden_concat, num_hidden=11)
 
-    label = mx.sym.Reshape(data=label, target_shape=(0,))
+    label = mx.sym.Reshape(data=label, shape=(-1,))
     label = mx.sym.Cast(data = label, dtype = 'int32')
     sm = mx.sym.WarpCTC(data=pred, label=label, label_length = num_label, input_length = seq_len)
     return sm