diff --git a/src/handlers.rs b/src/handlers.rs
index e3848da..65f9817 100644
--- a/src/handlers.rs
+++ b/src/handlers.rs
@@ -171,7 +171,10 @@ async fn make_table(brevo: Arc<Brevo>) -> Result<(), Rejection> {
         "
         CREATE TABLE IF NOT EXISTS urls (
             id VARCHAR({}) PRIMARY KEY,
-            url TEXT NOT NULL UNIQUE
+            url TEXT NOT NULL,
+            UNIQUE (
+                url(512)
+            )
         )                                    
         ",
         brevo.config.link_len