diff --git a/core/src/models/candidate.rs b/core/src/models/candidate.rs
index 521cade..79eb3ee 100644
--- a/core/src/models/candidate.rs
+++ b/core/src/models/candidate.rs
@@ -65,10 +65,10 @@ pub struct CandidateDetails {
     pub name: String,
     #[validate(length(min = 1, max = 255))]
     pub surname: String,
-    #[validate(length(min = 1, max = 255))]
     pub birth_surname: String,
     #[validate(length(min = 1, max = 255))]
     pub birthplace: String,
+    // NaiveDate validated natively
     pub birthdate: NaiveDate,
     #[validate(length(min = 1, max = 255))]
     pub address: String,
@@ -89,6 +89,7 @@ pub struct CandidateDetails {
     pub grades: GradeList,
     pub first_school: School,
     pub second_school: School,
+    #[validate(length(min = 1, max = 255))]
     pub test_language: String,
 }
 impl CandidateDetails {