diff --git a/api.php b/api.php
index 5aa19cd..2a8e438 100644
--- a/api.php
+++ b/api.php
@@ -137,7 +137,7 @@ LEFT JOIN dept_path dp ON u.department_id = dp.id";
             $check = $db->prepare("SELECT id FROM users WHERE emp_id = ?");
             $check->execute([$emp_id]);
             if ($check->fetch()) {
-                echo json_encode(['success' => false, 'error' => "이미 존재하는 사번(${emp_id})입니다."]);
+                echo json_encode(['success' => false, 'error' => "이미 존재하는 사번({$emp_id})입니다."]);
                 break;
             }
 
@@ -180,7 +180,7 @@ status) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)");
             $check = $db->prepare("SELECT id FROM users WHERE emp_id = ? AND id != ?");
             $check->execute([$emp_id, $user_id]);
             if ($check->fetch()) {
-                echo json_encode(['success' => false, 'error' => "이미 존재하는 사번(${emp_id})입니다."]);
+                echo json_encode(['success' => false, 'error' => "이미 존재하는 사번({$emp_id})입니다."]);
                 break;
             }