diff --git a/libavcodec/mpeg4audio.h b/libavcodec/mpeg4audio.h
index 98cddad2b100ba6501425339aac8793cf98bc8c4..5e3a1d39fb13f148de83660785d04330ccc6b864 100644
--- a/libavcodec/mpeg4audio.h
+++ b/libavcodec/mpeg4audio.h
@@ -92,6 +92,7 @@ enum AudioObjectType {
     AOT_SMR_MAIN,              ///< N                       Symbolic Music Representation Main
     AOT_USAC_NOSBR,            ///< N                       Unified Speech and Audio Coding (no SBR)
     AOT_SAOC,                  ///< N                       Spatial Audio Object Coding
+    AOT_LD_SURROUND,           ///< N                       Low Delay MPEG Surround
     AOT_USAC             = 45, ///< N                       Unified Speech and Audio Coding
 };