diff --git a/types/lodash/common/common.d.ts b/types/lodash/common/common.d.ts
index 864450b1bd..554fe76668 100644
--- a/types/lodash/common/common.d.ts
+++ b/types/lodash/common/common.d.ts
@@ -127,21 +127,21 @@ declare module "../index" {
          * @param key The key of the value to remove.
          * @return Returns `true` if the entry was removed successfully, else `false`.
          */
-        delete(key: string): boolean;
+        delete(key: any): boolean;
 
         /**
          * Gets the cached value for `key`.
          * @param key The key of the value to get.
          * @return Returns the cached value.
          */
-        get(key: string): any;
+        get(key: any): any;
 
         /**
          * Checks if a cached value for `key` exists.
          * @param key The key of the entry to check.
          * @return Returns `true` if an entry for `key` exists, else `false`.
          */
-        has(key: string): boolean;
+        has(key: any): boolean;
 
         /**
          * Sets `value` to `key` of the cache.
@@ -154,7 +154,7 @@ declare module "../index" {
         /**
          * Removes all key-value entries from the map.
          */
-        clear(): void;
+        clear?: () => void;
     }
     interface MapCacheConstructor {
         new (): MapCache;
diff --git a/types/lodash/lodash-tests.ts b/types/lodash/lodash-tests.ts
index 0515136714..3ce044165a 100644
--- a/types/lodash/lodash-tests.ts
+++ b/types/lodash/lodash-tests.ts
@@ -3484,6 +3484,11 @@ fp.now(); // $ExpectType number
 
     // $ExpectType MapCache
     new _.memoize.Cache();
+    _.memoize.Cache = WeakMap;
+    _.memoize.Cache = Map;
+    const memoizedFn = _.memoize(memoizeFn);
+    memoizedFn.cache = new WeakMap();
+    memoizedFn.cache = new Map();
 }
 
 // _.overArgs