diff --git a/lib/jkqtplotter/jkqtpbarchartelements.cpp b/lib/jkqtplotter/jkqtpbarchartelements.cpp
index fd80e6d23d..0109c630ee 100644
--- a/lib/jkqtplotter/jkqtpbarchartelements.cpp
+++ b/lib/jkqtplotter/jkqtpbarchartelements.cpp
@@ -602,7 +602,7 @@ QPen JKQTPbarVerticalGraph::getLinePen(JKQTPEnhancedPainter& painter) const {
     return p;
 }
 
-double JKQTPbarVerticalGraph::getParentStackedMax(int index) const
+double JKQTPbarVerticalGraph::getParentStackedMax(int /*index*/) const
 {
     return false;
 }
diff --git a/lib/jkqtplotter/jkqtpfilledcurveelements.cpp b/lib/jkqtplotter/jkqtpfilledcurveelements.cpp
index e46c3e9d0e..d4922a33a5 100644
--- a/lib/jkqtplotter/jkqtpfilledcurveelements.cpp
+++ b/lib/jkqtplotter/jkqtpfilledcurveelements.cpp
@@ -679,7 +679,7 @@ QColor JKQTPfilledVerticalRangeGraph::getKeyLabelColor()
     return color;
 }
 
-QBrush JKQTPfilledVerticalRangeGraph::getBrush(JKQTPEnhancedPainter &painter) const
+QBrush JKQTPfilledVerticalRangeGraph::getBrush(JKQTPEnhancedPainter &/*painter*/) const
 {
     QBrush b;
     b.setColor(fillColor);
diff --git a/lib/jkqtplotter/jkqtpparsedfunctionelements.cpp b/lib/jkqtplotter/jkqtpparsedfunctionelements.cpp
index 6d46de3d69..709a5cae93 100644
--- a/lib/jkqtplotter/jkqtpparsedfunctionelements.cpp
+++ b/lib/jkqtplotter/jkqtpparsedfunctionelements.cpp
@@ -43,7 +43,7 @@ double JKQTPxParsedFunctionLineGraphFunction(double x, void* data) {
                     return r.num;
                 }
             }
-        } catch(std::exception& E) {
+        } catch(std::exception& /*E*/) {
             //qDebug()<<QString("parser error: %1").arg(E.what());
            /*ok= QMessageBox::critical(this, tr("QuickFit-table"),
                                      tr("An error occured while parsing the expression '%1' in cell (row, column)=(%3, %4):\n%2\n\n\"OK\" will still go on evaluating\n\"Cancel\" will cancel evaluation for the rest of the cells.").arg(dlgMathExpression->getExpression()).arg(E.what()).arg(row).arg(column),
@@ -138,7 +138,7 @@ void JKQTPxParsedFunctionLineGraph::createPlotData(bool /*collectParams*/)
         //qDebug()<<"createPlotData():   adding variables: "<<t<<"ms";
         fdata.node=fdata.parser->parse(function.toStdString());
         //qDebug()<<"createPlotData():   parsing: "<<timer.elapsed()-t<<"ms";
-    } catch(std::exception& E) {
+    } catch(std::exception& /*E*/) {
         //qDebug()<<QString("parser error: %1").arg(E.what());
     }
 
@@ -171,7 +171,7 @@ void JKQTPxParsedFunctionLineGraph::createPlotData(bool /*collectParams*/)
         //qDebug()<<"createPlotData():   adding variables: "<<t-t0<<"ms";
         efdata.node=efdata.parser->parse(errorFunction.toStdString());
         //qDebug()<<"createPlotData():   parsing: "<<timer.elapsed()-t<<"ms";
-    } catch(std::exception& E) {
+    } catch(std::exception& /*E*/) {
         //qDebug()<<QString("parser error: %1").arg(E.what());
     }
 
diff --git a/test/jkqtplot_test/TestWidgetGraphs.cpp b/test/jkqtplot_test/TestWidgetGraphs.cpp
index a9dac2e9c5..197c62b162 100644
--- a/test/jkqtplot_test/TestWidgetGraphs.cpp
+++ b/test/jkqtplot_test/TestWidgetGraphs.cpp
@@ -297,7 +297,7 @@ void TestWidgetGraphs::moveovl() {
 }
 
 
-void TestWidgetGraphs::setErrorStyle(int index)
+void TestWidgetGraphs::setErrorStyle(int /*index*/)
 {
     QComboBox* cmb=qobject_cast<QComboBox*>(sender());
     if (cmb) {
@@ -314,7 +314,7 @@ void TestWidgetGraphs::setErrorStyle(int index)
     }
 }
 
-void TestWidgetGraphs::setESSymbol(int index)
+void TestWidgetGraphs::setESSymbol(int /*index*/)
 {
     QComboBox* cmb=qobject_cast<QComboBox*>(sender());
     if (cmb) {