diff --git a/libavcodec/dxa.c b/libavcodec/dxa.c
index eaff1ee11a..46b01cd816 100644
--- a/libavcodec/dxa.c
+++ b/libavcodec/dxa.c
@@ -187,7 +187,7 @@ static int decode_13(AVCodecContext *avctx, DxaDecContext *c, uint8_t* dst, uint
     return 0;
 }
 
-static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
+static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, const uint8_t *buf, int buf_size)
 {
     DxaDecContext * const c = avctx->priv_data;
     uint8_t *outptr, *srcptr, *tmpptr;