diff --git a/paddle/fluid/operators/ngraph/ops/activation_op.h b/paddle/fluid/operators/ngraph/ops/activation_op.h
index d04dbf648616d9957e2dfb0c416b624540747fe2..a66ec65a336f807f554157628888633db22ebfec 100644
--- a/paddle/fluid/operators/ngraph/ops/activation_op.h
+++ b/paddle/fluid/operators/ngraph/ops/activation_op.h
@@ -55,4 +55,4 @@ void BuildTanhGradNode(
 }  // namespace paddle
 
 REGISTER_NG_OP(relu_grad, BuildReluGradNode);
-REGISTER_NG_OP(than_grad, BuildTanhGradNode);
+REGISTER_NG_OP(tanh_grad, BuildTanhGradNode);