diff --git a/include/wx/datetime.h b/include/wx/datetime.h
index c9e9ec35e8..287655c6e7 100644
--- a/include/wx/datetime.h
+++ b/include/wx/datetime.h
@@ -1322,6 +1322,9 @@ public:
     // wxDateTimeHolidayAuthority)
     static void AddAuthority(wxDateTimeHolidayAuthority *auth);
 
+    // the base class must have a virtual dtor
+    virtual ~wxDateTimeHolidayAuthority();
+
 protected:
     // this function is called to determine whether a given day is a holiday
     virtual bool DoIsHoliday(const wxDateTime& dt) const = 0;
diff --git a/src/common/datetime.cpp b/src/common/datetime.cpp
index adc7531568..4f1df66c7e 100644
--- a/src/common/datetime.cpp
+++ b/src/common/datetime.cpp
@@ -3863,6 +3863,11 @@ void wxDateTimeHolidayAuthority::AddAuthority(wxDateTimeHolidayAuthority *auth)
     ms_authorities.Add(auth);
 }
 
+wxDateTimeHolidayAuthority::~wxDateTimeHolidayAuthority()
+{
+    // nothing to do here
+}
+
 // ----------------------------------------------------------------------------
 // wxDateTimeWorkDays
 // ----------------------------------------------------------------------------