diff --git a/Cargo.toml b/Cargo.toml
index 61f8bc2..413879c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "cas-lib"
-version = "0.2.63"
+version = "0.2.64"
 edition = "2021"
 description = "A function wrapper layer for RustCrypto and Dalek-Cryptography. Intended to be used in FFI situations with a global heap deallactor at the top level project."
 license = "Apache-2.0"
diff --git a/src/pqc/cas_pqc.rs b/src/pqc/cas_pqc.rs
index 24b5c73..4ff67e6 100644
--- a/src/pqc/cas_pqc.rs
+++ b/src/pqc/cas_pqc.rs
@@ -1,20 +1,24 @@
+#[repr(C)]
 #[derive(Debug, Clone)]
 pub struct MlKemKeyPair {
     pub secret_key: Vec<u8>,
     pub public_key: Vec<u8>,
 }
 
+#[repr(C)]
 #[derive(Debug, Clone)]
 pub struct MlKemEncapResult {
     pub ciphertext: Vec<u8>,
     pub shared_secret: Vec<u8>,
 }
 
+#[repr(C)]
 #[derive(Debug, Clone)]
 pub struct MlKemSharedSecret {
     pub shared_secret: Vec<u8>,
 }
 
+#[repr(C)]
 #[derive(Debug, Clone)]
 pub struct SlhDsaKeyPair {
     pub signing_key: Vec<u8>,