--- a/calendar/base/content/widgets/minimonth.xml
+++ b/calendar/base/content/widgets/minimonth.xml
@@ -862,25 +862,25 @@
           }
           // Update the calendar
           let calbox = document.getAnonymousElementByAttribute(this, "anonid", "minimonth-calendar");
           let date = this._getStartDate(aDate);
 
           // get today's date
           let today = new Date();
 
-          if (aDate.getFullYear() != (this.mValue || this.mExtraDate).getFullYear()) {
+          if (aDate.getFullYear() == (this.mValue || this.mExtraDate).getFullYear()) {
+              calbox.setAttribute("aria-label", cal.calGetString("dateFormat",
+                                  "month." + (aDate.getMonth() + 1) + ".name"));
+          } else {
               let monthName = cal.formatMonth(aDate.getMonth() + 1,
                                               "calendar", "monthInYear");
               let label = cal.calGetString("calendar", "monthInYear",
                                        [monthName, aDate.getFullYear()]);
               calbox.setAttribute("aria-label", label);
-          } else {
-              calbox.setAttribute("aria-label", cal.calGetString("dateFormat",
-                                  "month." + (aDate.getMonth() + 1) + ".name"));
           }
 
           this.mDayMap = {};
           let defaultTz = cal.calendarDefaultTimezone();
           let dateFormatter =
               Services.intl.createDateTimeFormat(undefined, { dateStyle: "long" });
           for (let k = 1; k < 7; k++) {
               // Set the week number.