diff --git a/types/lodash/common/lang.d.ts b/types/lodash/common/lang.d.ts
index 723388c9cc..cbfe0e56bb 100644
--- a/types/lodash/common/lang.d.ts
+++ b/types/lodash/common/lang.d.ts
@@ -1224,7 +1224,7 @@ declare module "../index" {
          * @param value The value to check.
          * @return Returns true if value is an object, else false.
          */
-        isObject(value?: any): boolean;
+        isObject(value?: any): value is object;
     }
 
     interface LoDashImplicitWrapper<TValue> {