diff --git a/Configuration/TCA/tx_sgjobs_domain_model_job.php b/Configuration/TCA/tx_sgjobs_domain_model_job.php
index e251c0de565ebf6fa0cc89572b97d5b8275634b9..e6a00b945c067c5c007fd159217622378daa1708 100644
--- a/Configuration/TCA/tx_sgjobs_domain_model_job.php
+++ b/Configuration/TCA/tx_sgjobs_domain_model_job.php
@@ -395,6 +395,7 @@ return call_user_func(
 					'config' => [
 						'type' => 'input',
 						'eval' => 'upper',
+						'max' => 3,
 					],
 				],
 				'salary_unit' => [