diff --git a/src/backends/octave/octaveexpression.cpp b/src/backends/octave/octaveexpression.cpp
index 6af43ca3..aea518d2 100644
--- a/src/backends/octave/octaveexpression.cpp
+++ b/src/backends/octave/octaveexpression.cpp
@@ -1,186 +1,188 @@
 /*
     Copyright (C) 2010 Miha Čančula <miha.cancula@gmail.com>
 
     This program is free software; you can redistribute it and/or
     modify it under the terms of the GNU General Public License
     as published by the Free Software Foundation; either version 2
     of the License, or (at your option) any later version.
 
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
 
     You should have received a copy of the GNU General Public License
     along with this program; if not, write to the Free Software
     Foundation, Inc., 51 Franklin Street, Fifth Floor,
     Boston, MA  02110-1301, USA.
 */
 
 #include "octaveexpression.h"
 #include "octavesession.h"
 #include "defaultvariablemodel.h"
 
 #include "textresult.h"
 
 #include <QDebug>
 #include <QFile>
 #include <helpresult.h>
 
 
 static const char* printCommand = "cantor_print();";
 
 OctaveExpression::OctaveExpression(Cantor::Session* session, bool internal): Expression(session, internal),
     m_plotPending(false),
     m_finished(false),
     m_appendPlotCommand(false),
     m_appendDot(false)
 {
     m_plotCommands << QLatin1String("plot") << QLatin1String("semilogx") << QLatin1String("semilogy") << QLatin1String("loglog")
                    << QLatin1String("polar") << QLatin1String("contour") << QLatin1String("bar")
                    << QLatin1String("stairs") << QLatin1String("errorbar")  << QLatin1String("sombrero")
                    << QLatin1String("hist") << QLatin1String("fplot") << QLatin1String("imshow")
                    << QLatin1String("stem") << QLatin1String("stem3") << QLatin1String("scatter") << QLatin1String("pareto") << QLatin1String("rose")
                    << QLatin1String("pie") << QLatin1String("quiver") << QLatin1String("compass") << QLatin1String("feather")
                    << QLatin1String("pcolor") << QLatin1String("area") << QLatin1String("fill") << QLatin1String("comet")
                    << QLatin1String("plotmatrix")
                    /* 3d-plots */
                    << QLatin1String("plot3")
                    << QLatin1String("mesh") << QLatin1String("meshc") << QLatin1String("meshz")
                    << QLatin1String("surf") << QLatin1String("surfc") << QLatin1String("surfl") << QLatin1String("surfnorm")
                    << QLatin1String("isosurface")<< QLatin1String("isonormals") << QLatin1String("isocaps")
                    /* 3d-plots defined by a function */
                    << QLatin1String("ezplot3") << QLatin1String("ezmesh") << QLatin1String("ezmeshc") << QLatin1String("ezsurf") << QLatin1String("ezsurfc");
     m_plotCommands << QLatin1String("cantor_plot2d") << QLatin1String("cantor_plot3d");
 }
 
 void OctaveExpression::interrupt()
 {
     qDebug() << "interrupt";
 
     if (m_appendPlotCommand)
         removeAppendedPlotCommand();
 
     setStatus(Interrupted);
 }
 
 void OctaveExpression::evaluate()
 {
     qDebug() << "evaluate";
     QString cmd = command();
     QStringList cmdWords = cmd.split(QRegExp(QLatin1String("\\b")), QString::SkipEmptyParts);
     if (!cmdWords.contains(QLatin1String("help")) && !cmdWords.contains(QLatin1String("completion_matches")))
     {
         foreach (const QString& plotCmd, m_plotCommands)
         {
             if (cmdWords.contains(plotCmd))
             {
                 setPlotPending(true);
                 qDebug() << "Executing a plot command";
                 break;
             }
         }
     }
     if ( m_plotPending && !cmd.contains(QLatin1String("cantor_plot")) && !cmd.contains(QLatin1String(printCommand)))
     {
         // This was a manual plot, we have to add a print command
         if (!cmd.endsWith(QLatin1Char(';')) && !cmd.endsWith(QLatin1Char(',')))
         {
             cmd += QLatin1Char(',');
             m_appendDot = true;
         }
         cmd += QLatin1String(printCommand);
         setCommand(cmd);
         m_appendPlotCommand = true;
     }
     m_finished = false;
     session()->enqueueExpression(this);
 }
 
 
 void OctaveExpression::parseOutput(const QString& output)
 {
     qDebug() << "parseOutput: " << output;
 
     if (m_appendPlotCommand)
         removeAppendedPlotCommand();
 
     if (!output.trimmed().isEmpty())
     {
         // TODO: what about help in comment? printf with '... help ...'?
         // This must be corrected.
         if (command().contains(QLatin1String("help")))
         {
             setResult(new Cantor::HelpResult(output));
         }
         else
         {
             setResult(new Cantor::TextResult(output));
         }
     }
 
     // TODO: remove this, then there is method for notify both Highlighter and variable model about new variable
     foreach ( const QString& line, output.simplified().split(QLatin1Char('\n'), QString::SkipEmptyParts) )
     {
         if ((output.contains(QLatin1Char('='))) && !(command().startsWith(QLatin1String("help(")))
                 && !(command().contains(QLatin1String("help "))) && !(command().contains(QLatin1String("type("))))
         {
             qDebug() << line;
             // Probably a new variable
             QStringList parts = line.split(QLatin1Char('='));
             if (parts.size() >= 2)
             {
                 Cantor::DefaultVariableModel* model = dynamic_cast<Cantor::DefaultVariableModel*>(session()->variableModel());
                 if (model)
                 {
-                    model->addVariable(parts.first().trimmed(), parts.last().trimmed());
+                    const QString varname = parts.first().trimmed();
+                    if (varname != QLatin1String("__cantor_tmp__"))
+                        model->addVariable(varname, parts.last().trimmed());
                 }
             }
         }
     }
 
     m_finished = true;
     if (!m_plotPending)
         setStatus(Done);
 }
 
 void OctaveExpression::parseError(const QString& error)
 {
     setErrorMessage(error);
     setStatus(Error);
 }
 
 void OctaveExpression::parsePlotFile(const QString& file)
 {
     qDebug() << "parsePlotFile";
     if (QFile::exists(file))
     {
         qDebug() << "OctaveExpression::parsePlotFile: " << file;
 
         setResult(new OctavePlotResult(QUrl::fromLocalFile(file)));
         setPlotPending(false);
 
         if (m_finished)
         {
             setStatus(Done);
         }
     }
 }
 
 void OctaveExpression::setPlotPending(bool plot)
 {
     m_plotPending = plot;
 }
 
 void OctaveExpression::removeAppendedPlotCommand()
 {
     QString cmd = command();
     cmd.remove(cmd.length()-strlen(printCommand),strlen(printCommand));
     m_appendPlotCommand = false;
     if (m_appendDot)
         {
         cmd.remove(cmd.length()-1,1);
         m_appendDot = false;
         }
     setCommand(cmd);
 }