diff --git a/src/FilterItem.svelte b/src/FilterItem.svelte
index e6ae46a..de2c632 100644
--- a/src/FilterItem.svelte
+++ b/src/FilterItem.svelte
@@ -80,10 +80,10 @@
     });
   }
 
-  const url = () => {
+  const url = (() => {
     const source = mkSource(item);
     return source ? source.export_url : undefined;
-  };
+  })();
 
   $: selected =
     $filtering === CHECKED ? [item, ...subselected.flat()] : subselected.flat();
@@ -97,7 +97,7 @@
       on:change={handleChange}
       value={item}
       bind:collapsed
-      url={url()}
+      {url}
     />
   </div>