diff --git a/src/jetstream/bulk.ts b/src/jetstream/bulk.ts
index a4d83b4..d729963 100644
--- a/src/jetstream/bulk.ts
+++ b/src/jetstream/bulk.ts
@@ -15,7 +15,7 @@ export type BulkDeps = {
 
 type BulkBuffer = {
   records: Record<string, unknown>[];
-  timer: number;
+  timer: ReturnType<typeof setTimeout>;
 };
 
 const bulkBuffers = new Map<string, BulkBuffer>();