diff --git a/lib/org-governance-stack.ts b/lib/org-governance-stack.ts
index 41b42e9..d680b89 100644
--- a/lib/org-governance-stack.ts
+++ b/lib/org-governance-stack.ts
@@ -305,6 +305,7 @@ export class OrgGovernanceStack extends cdk.Stack {
         securityOu.attrId,
         sandboxOu.attrId,
         graveyardOu.attrId,
+        "ou-nbuj-q34yz3ql", // external-dev (imported below; literal id matches its other SCP attachments)
       ],
       content: {
         Version: "2012-10-17",