diff --git a/src/musredit_qt5/musredit/PFitOutputHandler.cpp b/src/musredit_qt5/musredit/PFitOutputHandler.cpp
index 76d453f9..63828b86 100644
--- a/src/musredit_qt5/musredit/PFitOutputHandler.cpp
+++ b/src/musredit_qt5/musredit/PFitOutputHandler.cpp
@@ -48,7 +48,8 @@ PFitOutputHandler::PFitOutputHandler(QString workingDirectory, QVector<QString>
   // Layout
   fVbox = new QVBoxLayout( this );
 //Qt.3x  fVbox->resize(800, 500);
-  fOutput = new QTextEdit();
+  fOutput = new QPlainTextEdit();
+  fOutput->setMaximumBlockCount(1000);
   fVbox->addWidget(fOutput);
   fOutput->setMinimumSize(800, 455);
   fOutput->setReadOnly(true);
@@ -125,7 +126,7 @@ void PFitOutputHandler::readFromStdOut()
 {
   // Read and process the data.
   // Bear in mind that the data might be output in chunks.
-  fOutput->append( fProc->readAllStandardOutput() );
+  fOutput->appendPlainText( fProc->readAllStandardOutput() );
 }
 
 //----------------------------------------------------------------------------------------------------
@@ -136,7 +137,7 @@ void PFitOutputHandler::readFromStdErr()
 {
   // Read and process the data.
   // Bear in mind that the data might be output in chunks.
-  fOutput->append( fProc->readAllStandardError() );
+  fOutput->appendPlainText( fProc->readAllStandardError() );
 }
 
 //----------------------------------------------------------------------------------------------------
diff --git a/src/musredit_qt5/musredit/PFitOutputHandler.h b/src/musredit_qt5/musredit/PFitOutputHandler.h
index a04a02d8..1ece29bd 100644
--- a/src/musredit_qt5/musredit/PFitOutputHandler.h
+++ b/src/musredit_qt5/musredit/PFitOutputHandler.h
@@ -34,7 +34,7 @@
 #include <QProcess>
 #include <QDialog>
 #include <QVBoxLayout>
-#include <QTextEdit>
+#include <QPlainTextEdit>
 #include <QPushButton>
 #include <QMessageBox>
 #include <QVector>
@@ -66,7 +66,7 @@ private:
     QProcess *fProc; ///< pointer to the musrfit process
 
     QVBoxLayout *fVbox; ///< pointer to the dialog layout manager
-    QTextEdit *fOutput; ///< the captured musrfit output is written (read only) into this text edit object.
+    QPlainTextEdit *fOutput; ///< the captured musrfit output is written (read only) into this text edit object.
     QPushButton *fQuitButton; ///< quit button, either to interrupt the fit or to close the dialog at the end of the fit.
 };