diff --git a/include/taskschd.idl b/include/taskschd.idl
index 6b86a0175f3..d5577555e56 100644
--- a/include/taskschd.idl
+++ b/include/taskschd.idl
@@ -392,6 +392,21 @@ interface ITrigger : IDispatch
     [propput] HRESULT Enabled([in] VARIANT_BOOL enabled);
 }
 
+[
+    odl,
+    uuid(126c5cd8-b288-41d5-8dbf-e491446adc5c),
+    oleautomation,
+    dual,
+    nonextensible
+]
+interface IDailyTrigger : ITrigger
+{
+    [propget] HRESULT DaysInterval([out, retval] short *pDays);
+    [propput] HRESULT DaysInterval([in] short days);
+    [propget] HRESULT RandomDelay([out, retval] BSTR *pRandomDelay);
+    [propput] HRESULT RandomDelay([in] BSTR randomDelay);
+}
+
 [
     object,
     oleautomation,