diff --git a/src/server/api/endpoints/federation/instances.ts b/src/server/api/endpoints/federation/instances.ts
index 6b6fe42a40..d2aba4da82 100644
--- a/src/server/api/endpoints/federation/instances.ts
+++ b/src/server/api/endpoints/federation/instances.ts
@@ -82,9 +82,9 @@ export default define(meta, async (ps, me) => {
 	if (typeof ps.blocked === 'boolean') {
 		const meta = await fetchMeta(true);
 		if (ps.blocked) {
-			query.andWhere('instance.host IN (:...blocks)', { blocks: meta.blockedHosts });
+			query.andWhere(meta.blockedHosts.length === 0 ? '1=0': 'instance.host IN (:...blocks)', { blocks: meta.blockedHosts });
 		} else {
-			query.andWhere('instance.host NOT IN (:...blocks)', { blocks: meta.blockedHosts });
+			query.andWhere(meta.blockedHosts.length === 0 ? '1=1': 'instance.host NOT IN (:...blocks)', { blocks: meta.blockedHosts });
 		}
 	}