diff --git a/types/vuelidate/lib/validators.d.ts b/types/vuelidate/lib/validators.d.ts
index f335c4da3b..3f8ea48797 100644
--- a/types/vuelidate/lib/validators.d.ts
+++ b/types/vuelidate/lib/validators.d.ts
@@ -14,6 +14,7 @@ export interface ValidationParams {
 
 // const ValidationRule
 export interface ValidationRule {
+    (...params: any[]): boolean
     $params(): ValidationParams
     $pending(): boolean
 }
diff --git a/types/vuelidate/vuelidate-tests.ts b/types/vuelidate/vuelidate-tests.ts
index 794c2473fe..556d816ae6 100644
--- a/types/vuelidate/vuelidate-tests.ts
+++ b/types/vuelidate/vuelidate-tests.ts
@@ -19,9 +19,11 @@ const contains = (param: string): CustomRule =>
 
 const mustBeCool3 = helpers.withParams(
     { type: 'mustBeCool3' },
-    (value) => !helpers.req(value) || value.indexOf('cool') >= 0
+    (value: any) => !helpers.req(value) || value.indexOf('cool') >= 0
 )
 
+const mustBeCool3Result: boolean = mustBeCool3(50)
+
 const mustBeCool4 = helpers.regex('mustBeCool4', /^.*cool.*$/)
 
 const mustBeSame = (reference: string) => helpers.withParams(