diff --git a/nod/src/io/tgc.rs b/nod/src/io/tgc.rs
index e5ae834..2bd00d7 100644
--- a/nod/src/io/tgc.rs
+++ b/nod/src/io/tgc.rs
@@ -1,6 +1,7 @@
 use std::{
     io,
     io::{Read, Seek, SeekFrom},
+    mem::size_of,
     path::Path,
 };