diff --git a/ppocr/losses/rec_nrtr_loss.py b/ppocr/losses/rec_nrtr_loss.py
index 41714dd2a3ae15eeedc62521d97935f68271c598..76cd36b67b28063130b23ae362e93cdb168e9248 100644
--- a/ppocr/losses/rec_nrtr_loss.py
+++ b/ppocr/losses/rec_nrtr_loss.py
@@ -22,7 +22,7 @@ class NRTRLoss(nn.Layer):
             log_prb = F.log_softmax(pred, axis=1)
             non_pad_mask = paddle.not_equal(
                 tgt, paddle.zeros(
-                    tgt.shape, dtype='int64'))
+                    tgt.shape, dtype='int32'))
             loss = -(one_hot * log_prb).sum(axis=1)
             loss = loss.masked_select(non_pad_mask).mean()
         else: