diff --git a/libavcodec/h264_slice.c b/libavcodec/h264_slice.c
index 4e3abf859b..b0c890a251 100644
--- a/libavcodec/h264_slice.c
+++ b/libavcodec/h264_slice.c
@@ -1819,6 +1819,8 @@ static int h264_slice_header_parse(const H264Context *h, H264SliceContext *sl,
     if (nal->type == H264_NAL_IDR_SLICE)
         get_ue_golomb_long(&sl->gb); /* idr_pic_id */
 
+    sl->poc_lsb = 0;
+    sl->delta_poc_bottom = 0;
     if (sps->poc_type == 0) {
         sl->poc_lsb = get_bits(&sl->gb, sps->log2_max_poc_lsb);
 
@@ -1826,6 +1828,7 @@ static int h264_slice_header_parse(const H264Context *h, H264SliceContext *sl,
             sl->delta_poc_bottom = get_se_golomb(&sl->gb);
     }
 
+    sl->delta_poc[0] = sl->delta_poc[1] = 0;
     if (sps->poc_type == 1 && !sps->delta_pic_order_always_zero_flag) {
         sl->delta_poc[0] = get_se_golomb(&sl->gb);