diff --git a/decoder/ih264d_parse_slice.c b/decoder/ih264d_parse_slice.c
index 05a82a6..80603c2 100644
--- a/decoder/ih264d_parse_slice.c
+++ b/decoder/ih264d_parse_slice.c
@@ -1344,6 +1344,8 @@
                 ps_cur_slice->u1_redundant_pic_cnt = u1_redundant_pic_cnt;
                 ps_cur_slice->u1_nal_ref_idc = u1_nal_ref_idc;
                 ps_cur_slice->u1_pic_order_cnt_type = u1_pic_order_cnt_type;
+                ps_cur_slice->u1_mbaff_frame_flag = ps_seq->u1_mb_aff_flag
+                        && (!u1_field_pic_flag);
             }
         }
         else