diff --git a/libavcodec/snowdec.c b/libavcodec/snowdec.c
index c5fa20339a..e915b7b31c 100644
--- a/libavcodec/snowdec.c
+++ b/libavcodec/snowdec.c
@@ -370,6 +370,11 @@ static int decode_header(SnowContext *s){
         s->block_max_depth= 0;
         return AVERROR_INVALIDDATA;
     }
+    if (FFABS(s->qbias) > 127) {
+        av_log(s->avctx, AV_LOG_ERROR, "qbias %d is too large\n", s->qbias);
+        s->qbias = 0;
+        return AVERROR_INVALIDDATA;
+    }
 
     return 0;
 }