diff --git a/libavformat/img2.c b/libavformat/img2.c
index 0de2f8b9ed..58b0780a3a 100644
--- a/libavformat/img2.c
+++ b/libavformat/img2.c
@@ -75,6 +75,7 @@ static const IdStrMap img_tags[] = {
     { CODEC_ID_SUNRAST   , "im8"},
     { CODEC_ID_SUNRAST   , "im24"},
     { CODEC_ID_SUNRAST   , "sunras"},
+    { CODEC_ID_JPEG2000  , "j2k"},
     { CODEC_ID_JPEG2000  , "jp2"},
     { CODEC_ID_DPX       , "dpx"},
     { CODEC_ID_PICTOR    , "pic"},