diff --git a/MP4/box_tkhd.cpp b/MP4/box_tkhd.cpp
index 03bbaa7f..8a032b01 100644
--- a/MP4/box_tkhd.cpp
+++ b/MP4/box_tkhd.cpp
@@ -1,7 +1,7 @@
 #include "box_tkhd.h"
 
 Box_tkhd::Box_tkhd( ) {
-  Container = new Box( 0x6D646864 );
+  Container = new Box( 0x746B6864 );
   CurrentVersion = 0;
   CurrentFlags = 0;
 }