diff --git a/src/handlers/mod.ts b/src/handlers/mod.ts
index e726c50ba..23ecc45b2 100644
--- a/src/handlers/mod.ts
+++ b/src/handlers/mod.ts
@@ -195,7 +195,7 @@ export let handlers = {
 
 export type Handlers = typeof handlers;
 
-export function updateHandlers(newHandlers: Handlers) {
+export function updateHandlers(newHandlers: Partial<Handlers>) {
   handlers = {
     ...handlers,
     ...newHandlers,