diff --git a/libavcodec/sheervideo.c b/libavcodec/sheervideo.c
index f8490c916a..e8f008b7e4 100644
--- a/libavcodec/sheervideo.c
+++ b/libavcodec/sheervideo.c
@@ -2879,7 +2879,7 @@ static int decode_frame(AVCodecContext *avctx,
     AVFrame *p = data;
     GetBitContext gb;
     unsigned format;
-    char format_str[16];
+    char format_str[32];
     int ret;
 
     if (avpkt->size <= 20)