diff --git a/include/uiautomationcoreapi.h b/include/uiautomationcoreapi.h
index 22b3888dc6e..7f60fb45727 100644
--- a/include/uiautomationcoreapi.h
+++ b/include/uiautomationcoreapi.h
@@ -69,7 +69,7 @@ HRESULT WINAPI UiaGetReservedNotSupportedValue(IUnknown **value);
 int WINAPI UiaLookupId(enum AutomationIdentifierType type, const GUID *guid);
 BOOL WINAPI UiaPatternRelease(HUIAPATTERNOBJECT hobj);
 HRESULT WINAPI UiaRaiseAutomationEvent(IRawElementProviderSimple *provider, EVENTID id);
-HRESULT WINAPI UiaRaiseAutomationPropertyChangedEvent(IRawElementProviderSimple *provider, PROPERTYID id, VARIANT old, VARIANT new);
+HRESULT WINAPI UiaRaiseAutomationPropertyChangedEvent(IRawElementProviderSimple *, PROPERTYID, VARIANT, VARIANT);
 void WINAPI UiaRegisterProviderCallback(UiaProviderCallback *pCallback);
 LRESULT WINAPI UiaReturnRawElementProvider(HWND hwnd, WPARAM wParam, LPARAM lParam, IRawElementProviderSimple *elprov);
 BOOL WINAPI UiaTextRangeRelease(HUIATEXTRANGE hobj);