diff --git a/paddle/fluid/operators/roi_align_op_xpu.cc b/paddle/fluid/operators/roi_align_op_xpu.cc
index 75bd94142e6b7ff0a36220b594ba14380f65053b..699cc7b84a4e6d44ee733849f169ebfa072f14e9 100644
--- a/paddle/fluid/operators/roi_align_op_xpu.cc
+++ b/paddle/fluid/operators/roi_align_op_xpu.cc
@@ -62,7 +62,7 @@ class XPUROIAlignOpKernel : public framework::OpKernel<T> {
     } else {
       auto _rois_lod = rois->lod().back();
       rois_batch_size = _rois_lod.size() - 1;
-      for (int n = 0; n < _rois_lod.size(); ++n) {
+      for (int n = 0; n < static_cast<int>(_rois_lod.size()); ++n) {
         rois_lod[n] = _rois_lod[n];
       }
       PADDLE_ENFORCE_EQ(