diff --git a/src/basics/basics/writer/WbWriterVtkXmlASCII.cpp b/src/basics/basics/writer/WbWriterVtkXmlASCII.cpp
index 880fae2bf99d62bc7fa6d0336dfaf3cf9aacabb6..47b5d1fb26243d5c8b5d051ba2459e4219d5fe75 100644
--- a/src/basics/basics/writer/WbWriterVtkXmlASCII.cpp
+++ b/src/basics/basics/writer/WbWriterVtkXmlASCII.cpp
@@ -839,7 +839,7 @@ std::string WbWriterVtkXmlASCII::writeOctsWithCellData(const string& filename,ve
    return vtkfilename;
 }
 /*===============================================================================*/
-std::string WbWriterVtkXmlASCII::writeOctsWithNodeData(const string& filename,vector< UbTupleFloat3 >& nodes, vector< UbTupleInt8 >& cells, vector< string >& datanames, vector< vector< double > >& nodedata)
+std::string WbWriterVtkXmlASCII::writeOctsWithNodeData(const string& filename,vector< UbTupleFloat3 >& nodes, vector< UbTupleUInt8 >& cells, vector< string >& datanames, vector< vector< double > >& nodedata)
 {
    string vtkfilename=filename+getFileExtension();
    UBLOG(logDEBUG1,"WbWriterVtkXmlASCII::writeOctsWithNodeData to "<<vtkfilename<<" - start");
diff --git a/src/basics/basics/writer/WbWriterVtkXmlASCII.h b/src/basics/basics/writer/WbWriterVtkXmlASCII.h
index c2d908e14d14de71a9295b533c8b954baa2d155f..97e60486fc82deee1c634c4c5472781f48924b3a 100644
--- a/src/basics/basics/writer/WbWriterVtkXmlASCII.h
+++ b/src/basics/basics/writer/WbWriterVtkXmlASCII.h
@@ -113,7 +113,7 @@ public:
    //   0 ---- 1
    std::string writeOcts(const std::string& filename,std::vector< UbTupleFloat3 >& nodes, std::vector< UbTupleInt8 >& cells);
    std::string writeOctsWithCellData(const std::string& filename,std::vector< UbTupleFloat3 >& nodes, std::vector< UbTupleInt8 >& cells, std::vector< std::string >& datanames, std::vector< std::vector< double > >& celldata);
-   std::string writeOctsWithNodeData(const std::string& filename,std::vector< UbTupleFloat3 >& nodes, std::vector< UbTupleInt8 >& cells, std::vector< std::string >& datanames, std::vector< std::vector< double > >& nodedata);
+   std::string writeOctsWithNodeData(const std::string& filename,std::vector< UbTupleFloat3 >& nodes, std::vector< UbTupleUInt8 >& cells, std::vector< std::string >& datanames, std::vector< std::vector< double > >& nodedata);
 
 private: