diff --git a/ext/crypto/lib.deno_crypto.d.ts b/ext/crypto/lib.deno_crypto.d.ts
index f9849619eb..5369dac3b2 100644
--- a/ext/crypto/lib.deno_crypto.d.ts
+++ b/ext/crypto/lib.deno_crypto.d.ts
@@ -390,7 +390,7 @@ declare interface Crypto {
   >(
     array: T,
   ): T;
-  randomUUID(): string;
+  randomUUID(): `${string}-${string}-${string}-${string}-${string}`;
 }
 
 /** @category Web Crypto API */