diff --git a/src/modules/Sidebar/Sidebar.jsx b/src/modules/Sidebar/Sidebar.jsx
index 36f2dc4..fa5b0b3 100644
--- a/src/modules/Sidebar/Sidebar.jsx
+++ b/src/modules/Sidebar/Sidebar.jsx
@@ -44,7 +44,7 @@ const getRegionParam = (regionId) => {
     return { msk_ao: Number(id) };
   }
 
-  return { msk_rayon: Number(id) };
+  return { msk_rayon: Number(id) - 1 };
 };
 
 export const Sidebar = () => {