diff --git a/jxl/src/container/box_header.rs b/jxl/src/container/box_header.rs
index 309cbbd..920ff88 100644
--- a/jxl/src/container/box_header.rs
+++ b/jxl/src/container/box_header.rs
@@ -27,10 +27,6 @@ impl ContainerBoxHeader {
     pub(super) fn parse(reader: &super::ConcatSlice<'_, '_>) -> Result<HeaderParseResult, Error> {
         let mut buf = [0u8; 16];
         let buf = reader.peek(&mut buf);
-        if buf.len() < 8 {
-            return Ok(HeaderParseResult::NeedMoreData);
-        }
-
         let (tbox, box_size, header_size) = match *buf {
             [0, 0, 0, 1, t0, t1, t2, t3, s0, s1, s2, s3, s4, s5, s6, s7, ..] => {
                 let xlbox = u64::from_be_bytes([s0, s1, s2, s3, s4, s5, s6, s7]);