diff --git a/crates/core/src/repofile/keyfile.rs b/crates/core/src/repofile/keyfile.rs
index 3943ccc9..874705e0 100644
--- a/crates/core/src/repofile/keyfile.rs
+++ b/crates/core/src/repofile/keyfile.rs
@@ -1,3 +1,7 @@
+// needed to ensuer Rust 1.76.0 works
+#[allow(unused_imports)]
+use std::mem::size_of;
+
 use chrono::{DateTime, Local};
 use rand::{thread_rng, RngCore};
 use scrypt::Params;