diff --git a/MP4/box_esds.cpp b/MP4/box_esds.cpp
index b3310fdb..d4f0de18 100644
--- a/MP4/box_esds.cpp
+++ b/MP4/box_esds.cpp
@@ -1,38 +1,38 @@
-#include "box_mp4a.h"
+#include "box_esds.h"
 
-Box_mp4a::Box_mp4a( ) {
-  Container = new Box( 0x6D703461 );
+Box_esds::Box_esds( ) {
+  Container = new Box( 0x65736473 );
   SetReserved();
   SetDefaults();
 }
 
-Box_mp4a::~Box_mp4a() {
+Box_esds::~Box_esds() {
   delete Container;
 }
 
-Box * Box_mp4a::GetBox() {
+Box * Box_esds::GetBox() {
   return Container;
 }
 
-void Box_mp4a::SetDataReferenceIndex( uint16_t DataReferenceIndex ) {
+void Box_esds::SetDataReferenceIndex( uint16_t DataReferenceIndex ) {
   Container->SetPayload((uint32_t)2,Box::uint16_to_uint8( DataReferenceIndex ),6);
 }
 
-void Box_mp4a::SetChannelCount( uint16_t Count ) {
+void Box_esds::SetChannelCount( uint16_t Count ) {
   Container->SetPayload((uint32_t)2,Box::uint16_to_uint8( Count ),16);
 }
 
-void Box_mp4a::SetSampleSize( uint16_t Size ) {
+void Box_esds::SetSampleSize( uint16_t Size ) {
   Container->SetPayload((uint32_t)2,Box::uint16_to_uint8( Size ),18);
 }
 
-void Box_mp4a::SetReserved( ) {
+void Box_esds::SetReserved( ) {
   Container->SetPayload((uint32_t)4,Box::uint32_to_uint8( 0 ),20);
   Container->SetPayload((uint32_t)2,Box::uint16_to_uint8( 0 ),4);
   Container->SetPayload((uint32_t)4,Box::uint32_to_uint8( 0 ));
 }
 
-void Box_mp4a::SetDefaults( ) {
+void Box_esds::SetDefaults( ) {
   SetSampleSize( );
   SetChannelCount( );
   SetDataReferenceIndex( );
diff --git a/MP4/box_esds.h b/MP4/box_esds.h
index 850cf654..3cbeee5f 100644
--- a/MP4/box_esds.h
+++ b/MP4/box_esds.h
@@ -1,10 +1,10 @@
 #include "box.h"
 #include <string>
 
-class Box_mp4a {
+class Box_esds {
   public:
-    Box_mp4a( );
-    ~Box_mp4a();
+    Box_esds( );
+    ~Box_esds();
     Box * GetBox();
     void SetDataReferenceIndex( uint16_t DataReferenceIndex = 0);
     void SetChannelCount( uint16_t Count = 2 );