From libreoffice.

diff --git a/src/lib/IWORKTable.cpp b/src/lib/IWORKTable.cpp
index bde1011..a68f549 100644
--- a/src/lib/IWORKTable.cpp
+++ b/src/lib/IWORKTable.cpp
@@ -168,7 +168,7 @@ void parseDateTimeFormat(std::string const &format, librevenge::RVNGPropertyList
 
 void writeBorder(librevenge::RVNGPropertyList &props, const char *name, IWORKGridLine_t &line, unsigned index)
 {
-  if (!line.is_tree_valid())
+  if (!line.valid_tree())
     line.build_tree();
 
   IWORKStylePtr_t style;