diff --git a/inc/company_holiday_sync.inc.php b/inc/company_holiday_sync.inc.php
index e64b443..4372413 100644
--- a/inc/company_holiday_sync.inc.php
+++ b/inc/company_holiday_sync.inc.php
@@ -3,18 +3,32 @@
 if (!function_exists('vacationSyncTableExists')) {
     function vacationSyncTableExists(PDO $pdo, string $table): bool
     {
-        $stmt = $pdo->prepare("SHOW TABLES LIKE :table_name");
+        $stmt = $pdo->prepare(
+            "SELECT COUNT(*)
+             FROM information_schema.TABLES
+             WHERE TABLE_SCHEMA = DATABASE()
+               AND TABLE_NAME = :table_name"
+        );
         $stmt->execute(['table_name' => $table]);
-        return (bool)$stmt->fetchColumn();
+        return (int)$stmt->fetchColumn() > 0;
     }
 }
 
 if (!function_exists('vacationSyncTableHasColumn')) {
     function vacationSyncTableHasColumn(PDO $pdo, string $table, string $column): bool
     {
-        $stmt = $pdo->prepare("SHOW COLUMNS FROM `" . $table . "` LIKE :column_name");
-        $stmt->execute(['column_name' => $column]);
-        return (bool)$stmt->fetch(PDO::FETCH_ASSOC);
+        $stmt = $pdo->prepare(
+            "SELECT COUNT(*)
+             FROM information_schema.COLUMNS
+             WHERE TABLE_SCHEMA = DATABASE()
+               AND TABLE_NAME = :table_name
+               AND COLUMN_NAME = :column_name"
+        );
+        $stmt->execute([
+            'table_name' => $table,
+            'column_name' => $column,
+        ]);
+        return (int)$stmt->fetchColumn() > 0;
     }
 }