diff --git a/libavcodec/dpxenc.c b/libavcodec/dpxenc.c
index fa8a190aa2..de32e4e959 100644
--- a/libavcodec/dpxenc.c
+++ b/libavcodec/dpxenc.c
@@ -121,7 +121,9 @@ static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size,
     memcpy (buf +   8, "V1.0", 4);
     write32(buf +  20, 1); /* new image */
     write32(buf +  24, HEADER_SIZE);
-    memcpy (buf + 160, LIBAVCODEC_IDENT, FFMIN(sizeof(LIBAVCODEC_IDENT), 100));
+    if(!(avctx->flags & CODEC_FLAG_BITEXACT)){
+        memcpy (buf + 160, LIBAVCODEC_IDENT, FFMIN(sizeof(LIBAVCODEC_IDENT), 100));
+    }
     write32(buf + 660, 0xFFFFFFFF); /* unencrypted */
 
     /* Image information header */
diff --git a/tests/ref/lavf/dpx b/tests/ref/lavf/dpx
index 95a02c255a..a852ae058e 100644
--- a/tests/ref/lavf/dpx
+++ b/tests/ref/lavf/dpx
@@ -1,3 +1,3 @@
-a80049454fe1f00233be79b87a4f9c07 *./tests/data/images/dpx/02.dpx
+808ea110635774252439722a48329d61 *./tests/data/images/dpx/02.dpx
 ./tests/data/images/dpx/%02d.dpx CRC=0x6da01946
 305792 ./tests/data/images/dpx/02.dpx