diff --git a/app/code/Magento/Theme/view/frontend/templates/js/polyfill.phtml b/app/code/Magento/Theme/view/frontend/templates/js/polyfill.phtml
index 7e8854b914261..2b75bd2222e26 100644
--- a/app/code/Magento/Theme/view/frontend/templates/js/polyfill.phtml
+++ b/app/code/Magento/Theme/view/frontend/templates/js/polyfill.phtml
@@ -126,7 +126,7 @@
             };
 
             window.localStorage.__proto__ = window.localStorage = new Storage('local');
-            window.sessionStorage.__proto__ = window.sessionStorag = new Storage('session');
+            window.sessionStorage.__proto__ = window.sessionStorage = new Storage('session');
         })();
     }
 </script>