diff --git a/mmdet/models/roi_extractors/single_level.py b/mmdet/models/roi_extractors/single_level.py
index fa247a520be35abcd1e3b24135c4159e42ef4f95..b850d6ab680eaf0ef3a03890d75181d570d3b9f4 100644
--- a/mmdet/models/roi_extractors/single_level.py
+++ b/mmdet/models/roi_extractors/single_level.py
@@ -57,7 +57,7 @@ class SingleLevelRoI(nn.Module):
         proposals = proposals[:, :4]
         assigned_gt_inds, assigned_labels, argmax_overlaps, max_overlaps = \
             bbox_assign(proposals, gt_bboxes, gt_crowds, gt_labels,
-            cfg.pos_iou_thr, cfg.neg_iou_thr, cfg.pos_iou_thr, cfg.crowd_thr)
+            cfg.pos_iou_thr, cfg.neg_iou_thr, cfg.min_pos_iou, cfg.crowd_thr)
 
         if cfg.add_gt_as_proposals:
             proposals = torch.cat([gt_bboxes, proposals], dim=0)
diff --git a/tools/configs/r50_fpn_frcnn_1x.py b/tools/configs/r50_fpn_frcnn_1x.py
index 83ba65b896c32d9292d22e6791bd6c9ed87820df..e15cbdbfec52795ceb9ec12ef30f86d261e8f608 100644
--- a/tools/configs/r50_fpn_frcnn_1x.py
+++ b/tools/configs/r50_fpn_frcnn_1x.py
@@ -65,6 +65,7 @@ train_cfg = dict(
         pos_balance_sampling=False,
         neg_pos_ub=512,
         neg_balance_thr=0,
+        min_pos_iou=1.1,
         pos_weight=-1,
         debug=False))
 test_cfg = dict(
diff --git a/tools/configs/r50_fpn_maskrcnn_1x.py b/tools/configs/r50_fpn_maskrcnn_1x.py
index 2fa719980cfdf063caa7bbaf1b9d620648930b7d..5ecdaf44da91030efdd734c031499a6d7d7a66f5 100644
--- a/tools/configs/r50_fpn_maskrcnn_1x.py
+++ b/tools/configs/r50_fpn_maskrcnn_1x.py
@@ -77,6 +77,7 @@ train_cfg = dict(
         pos_balance_sampling=False,
         neg_pos_ub=512,
         neg_balance_thr=0,
+        min_pos_iou=1.1,
         pos_weight=-1,
         debug=False))
 test_cfg = dict(