diff --git a/libreplan-webapp/src/main/java/org/libreplan/web/calendars/BaseCalendarEditionController.java b/libreplan-webapp/src/main/java/org/libreplan/web/calendars/BaseCalendarEditionController.java
index 1de2afc2d..4b38ad100 100644
--- a/libreplan-webapp/src/main/java/org/libreplan/web/calendars/BaseCalendarEditionController.java
+++ b/libreplan-webapp/src/main/java/org/libreplan/web/calendars/BaseCalendarEditionController.java
@@ -537,6 +537,8 @@ public abstract class BaseCalendarEditionController extends
     public void highlightDaysOnCalendar() {
         Calendar calendar = (Calendar) window.getFellow("calendarWidget");
 
+        Clients.response(new AuInvoke(calendar, "resetHighlightedDates"));
+
         Map<String, List<Integer>> daysByColor = getDaysCurrentMonthByColor();
         for (String color : daysByColor.keySet()) {
             Clients.response(new AuInvoke(calendar, "highlightDates",
diff --git a/libreplan-webapp/src/main/webapp/calendars/_edition.zul b/libreplan-webapp/src/main/webapp/calendars/_edition.zul
index 082bd7d91..b61d68ca7 100644
--- a/libreplan-webapp/src/main/webapp/calendars/_edition.zul
+++ b/libreplan-webapp/src/main/webapp/calendars/_edition.zul
@@ -81,6 +81,14 @@
                         });
                     }
                 </attribute>
+                <attribute w:name="resetHighlightedDates">
+                    function () {
+                        var nodes = $('td', this).not('.z-outside');
+                        nodes.each(function () {
+                            $(this).css({color: "black", backgroundColor: "white"});
+                        });
+                    }
+                </attribute>
             </calendar>
 
             <grid width="180px" sclass="day-details">