diff --git a/drivers/gpu/nova-core/vbios.rs b/drivers/gpu/nova-core/vbios.rs
index 5b5d9f38cbb3..b4bca1919d8f 100644
--- a/drivers/gpu/nova-core/vbios.rs
+++ b/drivers/gpu/nova-core/vbios.rs
@@ -345,7 +345,7 @@ fn image_size_bytes(&self) -> usize {
 /// its header) is in the [`PciAtBiosImage`] and the falcon data it is pointing to is in the
 /// [`FwSecBiosImage`].
 #[derive(Debug, Clone, Copy)]
-#[expect(dead_code)]
+#[repr(C)]
 struct BitHeader {
     /// 0h: BIT Header Identifier (BMP=0x7FFF/BIT=0xB8FF)
     id: u16,
@@ -365,7 +365,7 @@ struct BitHeader {
 
 impl BitHeader {
     fn new(data: &[u8]) -> Result<Self> {
-        if data.len() < 12 {
+        if data.len() < core::mem::size_of::<Self>() {
             return Err(EINVAL);
         }