diff --git a/paddle/operators/row_conv_op.cu b/paddle/operators/row_conv_op.cu
index e0d7ebda7e76919f2d9be702a5399793278ccc43..79b7086b24c5fc950944cbb16e6bc7d5ee66fb56 100644
--- a/paddle/operators/row_conv_op.cu
+++ b/paddle/operators/row_conv_op.cu
@@ -243,7 +243,6 @@ __global__ void RowConvGradFilter(const T *in, const T *dout, int num_sequence,
                                   int block_x, int block_y,
                                   const size_t *batch_indices, T *dfilter) {
   int blx = blockDim.x;
-  int bly = blockDim.y;
   int thx = threadIdx.x;
   int thy = threadIdx.y;
   int gx = blockIdx.x * blx;