diff --git a/src/main/resources/mapper/TbProductMapper.xml b/src/main/resources/mapper/TbProductMapper.xml
index c4ed33d..2fef204 100644
--- a/src/main/resources/mapper/TbProductMapper.xml
+++ b/src/main/resources/mapper/TbProductMapper.xml
@@ -932,7 +932,7 @@
 
   <update id="updateStockById">
     update tb_product
-    set stock_number = stock_number - #{number,jdbcType=INTEGER}
+    set stock_number = stock_number - #{num,jdbcType=INTEGER}
     where id = #{productId}
   </update>