diff --git a/hwe/sammo/Constraint/AvailableRecruitCrewType.php b/hwe/sammo/Constraint/AvailableRecruitCrewType.php
index b083a39a..d4dcf4e4 100644
--- a/hwe/sammo/Constraint/AvailableRecruitCrewType.php
+++ b/hwe/sammo/Constraint/AvailableRecruitCrewType.php
@@ -53,11 +53,11 @@ class AvailableRecruitCrewType extends Constraint{
         }
 
         $crewType = GameUnitConst::byID($this->arg);
-        if($crewType->isValid($ownCities, $ownRegions, $year = $startyear, $tech)){
+        if($crewType->isValid($ownCities, $ownRegions, $year - $startyear, $tech)){
             return true;
         }
 
         $this->reason = "현재 선택할 수 없는 병종입니다.";
         return false;
     }
-}
\ No newline at end of file
+}