Index: writerfilter/source/rtftok/rtfsprm.hxx
--- writerfilter/source/rtftok/rtfsprm.hxx.orig
+++ writerfilter/source/rtftok/rtfsprm.hxx
@@ -13,6 +13,7 @@
 #include <utility>
 #include <vector>
 #include <map>
+#include <cstddef>
 
 #include <tools/ref.hxx>
 #include "rtfvalue.hxx"
