diff --git a/types/lodash/common/lang.d.ts b/types/lodash/common/lang.d.ts
index 14b00747a0..08860e268b 100644
--- a/types/lodash/common/lang.d.ts
+++ b/types/lodash/common/lang.d.ts
@@ -1020,7 +1020,7 @@ declare module "../index" {
 
     // isMatchWith
 
-    type isMatchWithCustomizer = (value: any, other: any, indexOrKey: PropertyName, object: object, source: object) => boolean;
+    type isMatchWithCustomizer = (value: any, other: any, indexOrKey: PropertyName, object: object, source: object) => boolean | undefined;
 
     interface LoDashStatic {
         /**