diff --git a/std/assembly/index.d.ts b/std/assembly/index.d.ts
index 7304a2586b..88d4f1f3f6 100644
--- a/std/assembly/index.d.ts
+++ b/std/assembly/index.d.ts
@@ -1430,7 +1430,7 @@ declare class Array<T> {
   join(separator?: string): string;
   reverse(): T[];
   /** Flattens an array of arrays. If any null entries exist in the array, they are ignored, unlike JavaScript's version of Array#flat(). */
-  flat(): valueof<T>[];
+  flat(): T extends unknown[] ? T : never;
   toString(): string;
 }