diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
index 6eb8a98e9..4df1fb2d1 100644
--- a/.github/CODEOWNERS
+++ b/.github/CODEOWNERS
@@ -74,6 +74,7 @@
 /rust/token_transfer/ @dfinity/growth
 /rust/token_transfer_from/ @dfinity/growth
 /rust/vetkd/ @dfinity/crypto-team
+/rust/x509/ @dfinity/crypto-team
 
 /svelte/svelte-motoko-starter/ @dfinity/sdk
 /svelte/svelte-starter/ @dfinity/sdk
diff --git a/rust/x509/src/x509_example_rust/tests/tests.rs b/rust/x509/src/x509_example_rust/tests/tests.rs
index c54ebb175..fa8eb91c9 100644
--- a/rust/x509/src/x509_example_rust/tests/tests.rs
+++ b/rust/x509/src/x509_example_rust/tests/tests.rs
@@ -230,9 +230,13 @@ fn generate_child_certificate_request(
 
     let mut req_builder = X509Req::builder().expect("failed to create X509Req builder");
 
+    req_builder
+        .set_version(0)
+        .expect("failed to set version in child certificate");
+
     req_builder
         .set_subject_name(&subject_name)
-        .expect("failed to set subject name");
+        .expect("failed to set subject name in child certificate");
     req_builder
         .set_pubkey(&key)
         .expect("failed to set public key in child certificate");