diff --git a/addons/web/static/src/core/ui/block_ui.scss b/addons/web/static/src/core/ui/block_ui.scss
index c75a769b306..b4b4f322138 100644
--- a/addons/web/static/src/core/ui/block_ui.scss
+++ b/addons/web/static/src/core/ui/block_ui.scss
@@ -1,5 +1,5 @@
 .o_blockUI {
-  position: absolute;
+  position: fixed;
   top: 0;
   left: 0;
   z-index: 1100;