diff --git a/preferencesdialog.cpp b/preferencesdialog.cpp
index 84ba215e..2bf0e9bf 100644
--- a/preferencesdialog.cpp
+++ b/preferencesdialog.cpp
@@ -241,26 +241,6 @@ void PreferencesDialog::on_IgnoreSlider_valueChanged(int position)
     } else ui->IgnoreLCD->display(tr("OFF"));
 }
 
-void PreferencesDialog::on_applicationFontSize_valueChanged(int arg1)
-{
-    ui->applicationFont->currentFont().setPointSize(arg1);
-}
-
-void PreferencesDialog::on_graphFontSize_valueChanged(int arg1)
-{
-    ui->graphFont->currentFont().setPointSize(arg1);
-}
-
-void PreferencesDialog::on_titleFontSize_valueChanged(int arg1)
-{
-    ui->titleFont->currentFont().setPointSize(arg1);
-}
-
-void PreferencesDialog::on_bigFontSize_valueChanged(int arg1)
-{
-    ui->bigFont->currentFont().setPointSize(arg1);
-}
-
 void PreferencesDialog::on_useGraphSnapshots_toggled(bool checked)
 {
     if (checked
diff --git a/preferencesdialog.h b/preferencesdialog.h
index 1a31293e..71972078 100644
--- a/preferencesdialog.h
+++ b/preferencesdialog.h
@@ -29,14 +29,6 @@ private slots:
 
     void on_IgnoreSlider_valueChanged(int value);
 
-    void on_applicationFontSize_valueChanged(int arg1);
-
-    void on_graphFontSize_valueChanged(int arg1);
-
-    void on_titleFontSize_valueChanged(int arg1);
-
-    void on_bigFontSize_valueChanged(int arg1);
-
     void on_useGraphSnapshots_toggled(bool checked);
 
 private: