diff --git a/libavformat/wav.c b/libavformat/wav.c
index 1ae9413aed..327d8917b8 100644
--- a/libavformat/wav.c
+++ b/libavformat/wav.c
@@ -387,7 +387,7 @@ static int wav_read_header(AVFormatContext *s,
     int rf64;
     unsigned int tag;
     AVIOContext *pb = s->pb;
-    AVStream *st;
+    AVStream *st = NULL;
     WAVContext *wav = s->priv_data;
     int ret, got_fmt = 0;
     int64_t next_tag_ofs, data_ofs = -1;