diff --git a/lite/kernels/arm/sequence_conv_compute.cc b/lite/kernels/arm/sequence_conv_compute.cc
index a70b6717097ec0ffdaa24ba257bfdf8dbd536f3f..69740a258be165f9ceec6829a81497e842b5a697 100644
--- a/lite/kernels/arm/sequence_conv_compute.cc
+++ b/lite/kernels/arm/sequence_conv_compute.cc
@@ -88,7 +88,7 @@ void SequenceConvCompute::Run() {
       paddle::lite::arm::math::im2col(
           sub_in_data,
           1,
-          sequence_len,
+          input_row_end - input_row_begin,
           hidden_dim,  // C H W -> 1, seq_len, hidden_dim
           kernel_size,
           hidden_dim,  // kernel_h, kernel_w