diff --git a/json-api/db/src/jwt.rs b/json-api/db/src/jwt.rs
index 26efeaa..016c6b8 100644
--- a/json-api/db/src/jwt.rs
+++ b/json-api/db/src/jwt.rs
@@ -13,7 +13,12 @@ pub async fn listed(p: &Pool, id: u64, given_rng_value: &str) -> Result<bool> {
 
 pub async fn insert(p: &Pool, id: u64, given_rng_value: &str) -> Result<()> {
     let mut conn = p.get_conn().await?;
-    let q = "INSERT INTO jwt (id, rng) VALUES (:id, :rng)";
-    conn.exec_drop(q, params!{"id" => id, "rng" => given_rng_value}).await?;
+    let q = "INSERT INTO jwt (id, rng) VALUES(:id, :rng)
+            ON DUPLICATE KEY UPDATE rng = :rng";
+    let p = params!{
+        "id" => id,
+        "rng" => given_rng_value,
+    };
+    conn.exec_drop(q, p).await?;
     Ok(())
 }