diff --git a/admin/repository/mysql_db.go b/admin/repository/mysql_db.go
index 18177e4..407963b 100644
--- a/admin/repository/mysql_db.go
+++ b/admin/repository/mysql_db.go
@@ -799,7 +799,7 @@ func migrateMySQLV30(db *sql.DB) error {
 			mapped_by VARCHAR(191) COLLATE utf8mb4_bin NOT NULL,
 			mapped_at VARCHAR(35) NOT NULL,
 			PRIMARY KEY (shopee_goods_id,shopee_color_key,pdd_goods_id),
-			KEY idx_product_color_mappings_pdd (pdd_goods_id,pdd_dimension_key,pdd_color_value)
+			KEY idx_product_color_mappings_pdd (pdd_goods_id,pdd_dimension_key,pdd_color_value(100))
 		) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci`,
 		`CREATE TABLE IF NOT EXISTS product_color_mapping_audits (
 			id BIGINT AUTO_INCREMENT PRIMARY KEY,