diff --git a/src/core/platform/web/function.js b/src/core/platform/web/function.js
index 47b6b9d39..152933882 100644
--- a/src/core/platform/web/function.js
+++ b/src/core/platform/web/function.js
@@ -145,6 +145,6 @@ BI._.extend(BI, {
         document.body.appendChild(el);
         const size = getComputedStyle(el).fontSize;
         el.remove();
-        return size;
+        return parseInt(size);
     }
 });