diff --git a/website/src/pages/seq/[accessionVersion].fa/index.ts b/website/src/pages/seq/[accessionVersion].fa/index.ts
index 7a4bec632..ece092572 100644
--- a/website/src/pages/seq/[accessionVersion].fa/index.ts
+++ b/website/src/pages/seq/[accessionVersion].fa/index.ts
@@ -3,7 +3,7 @@ import type { APIRoute } from 'astro';
 import { getReferenceGenomes } from '../../../config.ts';
 import { routes } from '../../../routes/routes.ts';
 import { LapisClient } from '../../../services/lapisClient.ts';
-import { createDownloadAPIRoute } from '../sequenceDownload.ts';
+import { createDownloadAPIRoute } from '../../../utils/createDownloadAPIRoute.ts';
 
 export const GET: APIRoute = createDownloadAPIRoute(
     'text/x-fasta',
diff --git a/website/src/pages/seq/[accessionVersion].tsv/index.ts b/website/src/pages/seq/[accessionVersion].tsv/index.ts
index 78d15b9e7..1b6de3e00 100644
--- a/website/src/pages/seq/[accessionVersion].tsv/index.ts
+++ b/website/src/pages/seq/[accessionVersion].tsv/index.ts
@@ -2,7 +2,7 @@ import type { APIRoute } from 'astro';
 
 import { routes } from '../../../routes/routes';
 import { LapisClient } from '../../../services/lapisClient';
-import { createDownloadAPIRoute } from '../sequenceDownload';
+import { createDownloadAPIRoute } from '../../../utils/createDownloadAPIRoute';
 
 export const GET: APIRoute = createDownloadAPIRoute(
     'text/tab-separated-values',
diff --git a/website/src/pages/seq/sequenceDownload.ts b/website/src/utils/createDownloadAPIRoute.ts
similarity index 94%
rename from website/src/pages/seq/sequenceDownload.ts
rename to website/src/utils/createDownloadAPIRoute.ts
index 848221451..e41f3419b 100644
--- a/website/src/pages/seq/sequenceDownload.ts
+++ b/website/src/utils/createDownloadAPIRoute.ts
@@ -1,10 +1,10 @@
 import type { APIRoute } from 'astro';
 import { err, type Result } from 'neverthrow';
 
-import { getConfiguredOrganisms } from '../../config';
-import { LapisClient } from '../../services/lapisClient';
-import { type ProblemDetail } from '../../types/backend';
-import { parseAccessionVersionFromString } from '../../utils/extractAccessionVersion';
+import { parseAccessionVersionFromString } from './extractAccessionVersion';
+import { getConfiguredOrganisms } from '../config';
+import { LapisClient } from '../services/lapisClient';
+import { type ProblemDetail } from '../types/backend';
 
 export type RedirectRoute = (
     accessionVersion:
@@ -104,6 +104,7 @@ const getSequenceDataWithOrganism = async (
 
     const dataResult: Result<string, ProblemDetail> = await getter(accessionVersion, organism);
 
+    // the result might be 'ok' but empty.
     if (dataResult.isOk()) {
         if (dataResult.value.trim().length === 0) {
             return err({