diff --git a/web3.js/flow-typed/bs58.js b/web3.js/flow-typed/bs58.js
index 2c90585f9d..191d28dace 100644
--- a/web3.js/flow-typed/bs58.js
+++ b/web3.js/flow-typed/bs58.js
@@ -1,5 +1,6 @@
 declare module "bs58" {
   declare module.exports: {
     encode(input: Buffer): string;
+    decode(input: string): Buffer;
   };
 }