diff --git a/dlls/comdlg32/itemdlg.c b/dlls/comdlg32/itemdlg.c
index 35910c30d4f..f44782818a0 100644
--- a/dlls/comdlg32/itemdlg.c
+++ b/dlls/comdlg32/itemdlg.c
@@ -354,6 +354,7 @@ static SIZE update_layout(FileDialogImpl *This)
     }
 
     /* Open/Save button */
+    hwnd = GetDlgItem(This->dlg_hwnd, IDOK);
     if(hwnd)
     {
         int open_width, open_height;