diff --git a/libavformat/a64.c b/libavformat/a64.c
index 786c75cc905ca3c493bf859a6fa1cc6ecaf36671..613efc0d13f0a59df12da3b8bc98009669744e37 100644
--- a/libavformat/a64.c
+++ b/libavformat/a64.c
@@ -24,7 +24,7 @@
 #include "avformat.h"
 #include "rawenc.h"
 
-static int a64_write_header(struct AVFormatContext *s)
+static int a64_write_header(AVFormatContext *s)
 {
     AVCodecContext *avctx = s->streams[0]->codec;
     uint8_t header[5] = {