diff --git a/dvb/dvb.c b/dvb/dvb.c
index cef8bcc..8a430c0 100644
--- a/dvb/dvb.c
+++ b/dvb/dvb.c
@@ -30,7 +30,7 @@ void write_aac_descriptor( bs_t *s, ts_int_stream_t *stream )
     bs_write( s, 8, 2 );                      // descriptor_length
     bs_write( s, 8, stream->aac_profile );    // profile_and_level
     bs_write( s, 1, 0 );                      // AAC_type_flag
-    bs_write( s, 7, 0x7f );                   // reserved
+    bs_write( s, 7, 0 );                      // reserved
 }
 
 void write_adaptation_field_data_descriptor( bs_t *s, uint8_t identifier )