diff --git a/src/data-structures/hash/hash-map.ts b/src/data-structures/hash/hash-map.ts
index 554556c..0c189b5 100644
--- a/src/data-structures/hash/hash-map.ts
+++ b/src/data-structures/hash/hash-map.ts
@@ -20,7 +20,7 @@ export class HashMap<K = any, V = any> {
   protected _objHashFn: (key: K) => object;
 
 
-  constructor(elements?: Iterable<[K, V]>, options: HashMapOptions<K, V> = {
+  constructor(elements?: Iterable<[K, V]>, options: HashMapOptions<K> = {
 
     hashFn: (key: K) => String(key),
     objHashFn: (key: K) => (<object>key)
diff --git a/src/types/data-structures/hash/hash-map.ts b/src/types/data-structures/hash/hash-map.ts
index 8889ff2..294fa59 100644
--- a/src/types/data-structures/hash/hash-map.ts
+++ b/src/types/data-structures/hash/hash-map.ts
@@ -5,7 +5,7 @@ export type HashMapLinkedNode<K, V> = {
   prev: HashMapLinkedNode<K, V>;
 };
 
-export type HashMapOptions<K, V> = {
+export type HashMapOptions<K> = {
   hashFn: (key: K) => string;
   objHashFn: (key: K) => object
 }