diff --git a/src/vaadin-month-calendar.html b/src/vaadin-month-calendar.html
index 219ef146..6af69e85 100644
--- a/src/vaadin-month-calendar.html
+++ b/src/vaadin-month-calendar.html
@@ -329,7 +329,7 @@
         }
 
         _getRole(date) {
-          return date ? 'button' : 'presentational';
+          return date ? 'button' : 'presentation';
         }
 
         _getAriaLabel(date) {