1 files changed, 2 insertions, 3 deletions
diff --git a/matroska/src/write.rs b/matroska/src/write.rs
index aaf11d9..7eb13f1 100644
--- a/matroska/src/write.rs
+++ b/matroska/src/write.rs
@@ -240,15 +240,14 @@ impl WriteValue for EbmlSize {
     fn write_to(&self, w: &mut impl Write) -> Result<()> {
         match self {
             EbmlSize::Exact(s) => write_vint(w, *s as u64)?,
-            EbmlSize::Unknown => w.write_all(&(u64::MAX >> 7).to_be_bytes())?,
+            EbmlSize::Unknown => w.write_all(&[0xff])?,
         }
         Ok(())
     }
-
     fn size(&self) -> usize {
         match self {
             EbmlSize::Exact(s) => vint_length(*s as u64),
-            EbmlSize::Unknown => 8,
+            EbmlSize::Unknown => 1,
         }
     }
 }