diff --git a/types/bn.js/index.d.ts b/types/bn.js/index.d.ts
index 8c0bc8dd5f..db4c9f8b9e 100644
--- a/types/bn.js/index.d.ts
+++ b/types/bn.js/index.d.ts
@@ -45,7 +45,7 @@ interface ReductionContext {
 declare class BN {
     constructor(
         number: number | string | number[] | Buffer | BN,
-        base?: number,
+        base?: number | 'hex',
         endian?: Endianness
     );
     constructor(