diff --git a/addons/web/static/src/less/tooltip.less b/addons/web/static/src/less/tooltip.less
index dad63e374fa..e071bf04a40 100644
--- a/addons/web/static/src/less/tooltip.less
+++ b/addons/web/static/src/less/tooltip.less
@@ -5,6 +5,8 @@
     opacity: 1;
 
     .tooltip-inner {
+        max-width: 300px; // fallback for browsers which do not support "vw" unit
+        max-width: 100vw;
         background-color: @odoo-tooltip-background-color;
         color: @odoo-tooltip-color;
         border-radius: @border-radius-base;