--- a/src/lib/MultiplanParser.cxx
+++ b/src/lib/MultiplanParser.cxx
@@ -747,7 +747,7 @@ bool MultiplanParser::readSharedData(int pos, int cellType, MWAWVec2i const &cel
         f << "Nan" << input->readULong(1) << ",";
         input->seek(7, librevenge::RVNG_SEEK_CUR);
         content.m_contentType=content.C_NUMBER;
-        content.setValue(std::nan(""));
+        content.setValue(nan(""));
       }
       break;
     case 3:
@@ -1594,7 +1594,7 @@ bool MultiplanParser::sendCell(MWAWVec2i const &cellPos, int p)
     f << name << ",";
   }
   else if ((type&0x3)==2 && dSz==8) {
-    content.setValue(std::nan(""));
+    content.setValue(nan(""));
     f << "Nan" << input->readULong(1) << ",";
     input->seek(7, librevenge::RVNG_SEEK_CUR);
   }