diff --git a/src/rollup/types.d.ts b/src/rollup/types.d.ts
index 30f5f38477f..96059e6bce8 100644
--- a/src/rollup/types.d.ts
+++ b/src/rollup/types.d.ts
@@ -664,7 +664,7 @@ export interface RollupWatcher
 	close(): void;
 }
 
-export function watch(configs: RollupWatchOptions[]): RollupWatcher;
+export function watch(config: RollupWatchOptions | RollupWatchOptions[]): RollupWatcher;
 
 interface AcornNode {
 	end: number;