diff --git a/lodash/index.d.ts b/lodash/index.d.ts
index 70b086188c..d5453f4b91 100644
--- a/lodash/index.d.ts
+++ b/lodash/index.d.ts
@@ -12701,7 +12701,7 @@ declare namespace _ {
          * @param value The value to check.
          * @returns Returns true if value is correctly classified, else false.
          */
-        isWeakMap<K, V>(value?: any): value is WeakMap<K, V>;
+        isWeakMap<K extends object, V>(value?: any): value is WeakMap<K, V>;
     }
 
     interface LoDashImplicitWrapperBase<T, TWrapper> {