diff --git a/backend/src/share/dto/sharePassword.dto.ts b/backend/src/share/dto/sharePassword.dto.ts
index dee8b68..f1bcf73 100644
--- a/backend/src/share/dto/sharePassword.dto.ts
+++ b/backend/src/share/dto/sharePassword.dto.ts
@@ -1,3 +1,6 @@
+import { IsString } from "class-validator";
+
 export class SharePasswordDto {
+  @IsString()
   password: string;
 }