diff --git a/libavformat/sdp.c b/libavformat/sdp.c
index a5d202e99c..34e9839b67 100644
--- a/libavformat/sdp.c
+++ b/libavformat/sdp.c
@@ -347,7 +347,8 @@ static char *extradata2config(AVFormatContext *s, AVCodecParameters *par)
 
 static char *xiph_extradata2config(AVFormatContext *s, AVCodecParameters *par)
 {
-    char *config, *encoded_config;
+    uint8_t *config;
+    char *encoded_config;
     const uint8_t *header_start[3];
     int headers_len, header_len[3], config_len;
     int first_header_size;