diff --git a/dist/Resource.d.ts b/dist/Resource.d.ts
index 5f629da..5cc85df 100644
--- a/dist/Resource.d.ts
+++ b/dist/Resource.d.ts
@@ -4,5 +4,5 @@ export default class Resource {
     uid: string;
     static hydrate<T extends Resource>(from: Partial<T>, options?: ClassTransformOptions): T;
     static validateOrReject(validatorOptions?: ValidatorOptions): Promise<void>;
-    validateOrReject(validatorOptions?: ValidatorOptions): Promise<void>;
+    validateOrReject?(validatorOptions?: ValidatorOptions): Promise<void>;
 }
diff --git a/src/Resource.ts b/src/Resource.ts
index fd23d23..28f5b26 100644
--- a/src/Resource.ts
+++ b/src/Resource.ts
@@ -14,7 +14,7 @@ export default class Resource {
         return validator.validateOrReject(this, validatorOptions);
     }
 
-    public validateOrReject(validatorOptions?: ValidatorOptions){
+    public validateOrReject?(validatorOptions?: ValidatorOptions){
         return validator.validateOrReject(this, validatorOptions);
     }
 }
\ No newline at end of file