diff --git a/website/src/pages/[organism]/search/index.astro b/website/src/pages/[organism]/search/index.astro
index 51a22ed48..4e87f27c9 100644
--- a/website/src/pages/[organism]/search/index.astro
+++ b/website/src/pages/[organism]/search/index.astro
@@ -25,7 +25,9 @@ const lapisUrl = getLapisUrl(clientConfig, organism);
 let postParams = new URLSearchParams();
 
 if (Astro.request.method === 'POST') {
-    const decoded = await Astro.request.formData();
+    const formData = await Astro.request.text();
+    const params = new URLSearchParams(formData);
+    const decoded = Object.fromEntries(params);
     const paramsString = decoded.searchQuery;
     postParams = new URLSearchParams(paramsString);
 }