diff --git a/kernels/generate_proposals_v2/generate_proposals_v2_nms_utils.h b/kernels/generate_proposals_v2/generate_proposals_v2_nms_utils.h
index fadcacbff..5e4d467f5 100644
--- a/kernels/generate_proposals_v2/generate_proposals_v2_nms_utils.h
+++ b/kernels/generate_proposals_v2/generate_proposals_v2_nms_utils.h
@@ -329,9 +329,9 @@ __mlu_func__ void nonMaximumSuppress(
   int core_num = 0;
   int nram_save_count = 0;
 
-  limit =
-      (MAX_NRAM_SIZE - NFU_ALIGN_SIZE - nram_save_limit_count * sizeof(T) * 5) /
-      memory_block;
+  limit = (MAX_NRAM_SIZE - NFU_ALIGN_SIZE * sizeof(T) -
+           nram_save_limit_count * sizeof(T) * 5) /
+          memory_block;
   getComputeParams(scores_num, limit, memory_block, sizeof(T), &max_seg_num,
                    &repeat, &remain_num, &core_num, &core_offset);
   // init nram ptr