diff --git a/themes/bitix/layouts/partials/html-head-ad-manager.html b/themes/bitix/layouts/partials/html-head-ad-manager.html
index 9edf14faf3..c20e3bd101 100644
--- a/themes/bitix/layouts/partials/html-head-ad-manager.html
+++ b/themes/bitix/layouts/partials/html-head-ad-manager.html
@@ -30,13 +30,11 @@
         .addSize([0, 0], [[468, 90], [300, 90]])
         .build();
       var sidebarLeftMapping = googletag.sizeMapping()
-        .addSize([1440, 0], [[300, 600]])
-        .addSize([1366, 0], [[250, 600], [160, 600]])
-        .addSize([1280, 0], [[160, 600]])
+        .addSize([1750, 0], [[300, 600]])
         .build();
       var sidebarRightMapping = googletag.sizeMapping()
         .addSize([1440, 0], [[300, 600]])
-        .addSize([1366, 0], [[250, 600], [160, 600]])
+        .addSize([1366, 0], [[250, 600]])
         .addSize([1280, 0], [[160, 600]])
         .build();