1 files changed, 6 insertions, 1 deletions

diff --git a/src/dutil/inc/wiutil.h b/src/dutil/inc/wiutil.h
index 4264b815..07f6b56c 100644
--- a/src/dutil/inc/wiutil.h
+++ b/src/dutil/inc/wiutil.h
@@ -330,10 +330,15 @@ HRESULT DAPI WiuEnableLog(
     __in_z LPCWSTR wzLogFile,
     __in DWORD dwLogAttributes
     );
+HRESULT DAPI WiuInitializeInternalUI(
+    __in INSTALLUILEVEL internalUILevel,
+    __in_opt HWND hwndParent,
+    __in WIU_MSI_EXECUTE_CONTEXT* pExecuteContext
+    );
 HRESULT DAPI WiuInitializeExternalUI(
     __in PFN_MSIEXECUTEMESSAGEHANDLER pfnMessageHandler,
     __in INSTALLUILEVEL internalUILevel,
-    __in HWND hwndParent,
+    __in_opt HWND hwndParent,
     __in LPVOID pvContext,
     __in BOOL fRollback,
     __in WIU_MSI_EXECUTE_CONTEXT* pExecuteContext