diff --git a/libavformat/avc.c b/libavformat/avc.c
index 09f31a15fe..cd15ca7ce7 100644
--- a/libavformat/avc.c
+++ b/libavformat/avc.c
@@ -79,7 +79,7 @@ int ff_avc_parse_nal_units(ByteIOContext *pb, const uint8_t *buf_in, int size)
     return size;
 }
 
-static int ff_avc_parse_nal_units_buf(const uint8_t *buf_in, uint8_t **buf, int *size)
+int ff_avc_parse_nal_units_buf(const uint8_t *buf_in, uint8_t **buf, int *size)
 {
     ByteIOContext *pb;
     int ret = url_open_dyn_buf(&pb);
diff --git a/libavformat/avc.h b/libavformat/avc.h
index 2ea938ca16..364c69f629 100644
--- a/libavformat/avc.h
+++ b/libavformat/avc.h
@@ -25,7 +25,8 @@
 #include <stdint.h>
 #include "avio.h"
 
-int ff_avc_parse_nal_units(const uint8_t *buf_in, uint8_t **buf, int *size);
+int ff_avc_parse_nal_units(const uint8_t *buf_in, uint8_t **buf, int size);
+int ff_avc_parse_nal_units_buf(const uint8_t *buf_in, uint8_t **buf, int *size);
 int ff_isom_write_avcc(ByteIOContext *pb, const uint8_t *data, int len);
 const uint8_t *ff_avc_find_startcode(const uint8_t *p, const uint8_t *end);