diff --git a/libavcodec/rv10.c b/libavcodec/rv10.c
index b6719eb8da..7ee812a7e0 100644
--- a/libavcodec/rv10.c
+++ b/libavcodec/rv10.c
@@ -597,7 +597,7 @@ static int rv10_decode_end(AVCodecContext *avctx)
 }
 
 static int rv10_decode_packet(AVCodecContext *avctx,
-                             uint8_t *buf, int buf_size)
+                             const uint8_t *buf, int buf_size)
 {
     MpegEncContext *s = avctx->priv_data;
     int mb_count, mb_pos, left, start_mb_x;
@@ -711,7 +711,7 @@ static int rv10_decode_packet(AVCodecContext *avctx,
     return buf_size;
 }
 
-static int get_slice_offset(AVCodecContext *avctx, uint8_t *buf, int n)
+static int get_slice_offset(AVCodecContext *avctx, const uint8_t *buf, int n)
 {
     if(avctx->slice_count) return avctx->slice_offset[n];
     else                   return AV_RL32(buf + n*8);
@@ -719,13 +719,13 @@ static int get_slice_offset(AVCodecContext *avctx, uint8_t *buf, int n)
 
 static int rv10_decode_frame(AVCodecContext *avctx,
                              void *data, int *data_size,
-                             uint8_t *buf, int buf_size)
+                             const uint8_t *buf, int buf_size)
 {
     MpegEncContext *s = avctx->priv_data;
     int i;
     AVFrame *pict = data;
     int slice_count;
-    uint8_t *slices_hdr = NULL;
+    const uint8_t *slices_hdr = NULL;
 
 #ifdef DEBUG
     av_log(avctx, AV_LOG_DEBUG, "*****frame %d size=%d\n", avctx->frame_number, buf_size);