diff --git a/packages/common/pipes/validation.pipe.ts b/packages/common/pipes/validation.pipe.ts
index 6163ea0d4d5..11de63be218 100644
--- a/packages/common/pipes/validation.pipe.ts
+++ b/packages/common/pipes/validation.pipe.ts
@@ -206,6 +206,9 @@ export class ValidationPipe implements PipeTransform<any> {
     if (metatype === Number) {
       return +value;
     }
+    if (metatype === String) {
+      return String(value);
+    }
     return value;
   }