diff --git a/index.d.ts b/index.d.ts
index d7dd525..fccc626 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -5,7 +5,7 @@ declare namespace cuid2 {
   }
 
   export function init(options?: {
-    random?: number
+    random?: () => number
     counter?: () => number
     length?: number
     fingerprint?: string