diff --git a/libavcodec/crystalhd.c b/libavcodec/crystalhd.c
index 12a8f8e02b..3f4502b3d0 100644
--- a/libavcodec/crystalhd.c
+++ b/libavcodec/crystalhd.c
@@ -419,7 +419,7 @@ static av_cold int init(AVCodecContext *avctx)
             int dummy_int;
 
             /* Back up the extradata so it can be restored at close time. */
-            priv->orig_extradata = av_malloc(avctx->extradata_size);
+            priv->orig_extradata = av_malloc(avctx->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
             if (!priv->orig_extradata) {
                 av_log(avctx, AV_LOG_ERROR,
                        "Failed to allocate copy of extradata\n");