diff --git a/SoObjects/Appointments/SOGoCalendarComponent.m b/SoObjects/Appointments/SOGoCalendarComponent.m
index cc3847bcdf..6ae1c78410 100644
--- a/SoObjects/Appointments/SOGoCalendarComponent.m
+++ b/SoObjects/Appointments/SOGoCalendarComponent.m
@@ -935,6 +935,9 @@ - (void) sendIMIPReplyForEvent: (iCalRepeatableEntityObject *) event
   if ([[context objectForKey: @"DeviceType"] isEqualToString: @"WindowsOutlook15"])
     return;
 
+  // remove all alarms to avoid bug #3925
+  [event removeAllAlarms];
+
   dd = [from domainDefaults];
   if ([dd appointmentSendEMailNotifications] && [event isStillRelevant])
     {