diff --git a/libavcodec/dca.c b/libavcodec/dca.c
index 307b21471e..942fe6c3c9 100644
--- a/libavcodec/dca.c
+++ b/libavcodec/dca.c
@@ -146,7 +146,7 @@ int ff_dca_parse_core_frame_header(DCACoreFrameHeader *h, GetBitContext *gb)
     return 0;
 }
 
-int avpriv_dca_parse_core_frame_header(DCACoreFrameHeader *h, uint8_t *buf, int size)
+int avpriv_dca_parse_core_frame_header(DCACoreFrameHeader *h, const uint8_t *buf, int size)
 {
     GetBitContext gb;
 
diff --git a/libavcodec/dca.h b/libavcodec/dca.h
index 172c965b3b..c70598af92 100644
--- a/libavcodec/dca.h
+++ b/libavcodec/dca.h
@@ -213,7 +213,7 @@ int avpriv_dca_convert_bitstream(const uint8_t *src, int src_size, uint8_t *dst,
  * Parse and validate core frame header
  * @return 0 on success, negative DCA_PARSE_ERROR_ code on failure
  */
-int avpriv_dca_parse_core_frame_header(DCACoreFrameHeader *h, uint8_t *buf, int size);
+int avpriv_dca_parse_core_frame_header(DCACoreFrameHeader *h, const uint8_t *buf, int size);
 
 int ff_dca_parse_core_frame_header(DCACoreFrameHeader *h, GetBitContext *gb);