diff --git a/libavcodec/dirac_parser.c b/libavcodec/dirac_parser.c
index 45ded5a779..83c35a2010 100644
--- a/libavcodec/dirac_parser.c
+++ b/libavcodec/dirac_parser.c
@@ -123,7 +123,7 @@ static int dirac_combine_frame(AVCodecParserContext *s, AVCodecContext *avctx,
     DiracParseContext *pc = s->priv_data;
 
     if (pc->overread_index) {
-        memcpy(pc->buffer, pc->buffer + pc->overread_index,
+        memmove(pc->buffer, pc->buffer + pc->overread_index,
                pc->index - pc->overread_index);
         pc->index         -= pc->overread_index;
         pc->overread_index = 0;