diff --git a/sources/properties/terminaldata.cpp b/sources/properties/terminaldata.cpp
index ab72f9e62..57ac35609 100644
--- a/sources/properties/terminaldata.cpp
+++ b/sources/properties/terminaldata.cpp
@@ -38,11 +38,13 @@ void TerminalData::setParent(QGraphicsObject* parent)
 
 	QString is use for prefix a word befor the name of each paramètre
 	@param settings UNUSED
+	@param prefix UNUSED
 */
-void TerminalData::toSettings(QSettings &settings, const QString) const
+void TerminalData::toSettings(QSettings &settings, const QString prefix) const
 
 {
 	Q_UNUSED(settings);
+	Q_UNUSED(prefix);
 }
 
 /**
@@ -51,10 +53,12 @@ void TerminalData::toSettings(QSettings &settings, const QString) const
 
 	QString is use for prefix a word befor the name of each paramètre
 	@param settings UNUSED
+	@param prefix UNUSED
 */
-void TerminalData::fromSettings(const QSettings &settings, const QString)
+void TerminalData::fromSettings(const QSettings &settings, const QString prefix)
 {
 	Q_UNUSED(settings);
+	Q_UNUSED(prefix);
 }
 
 /**
diff --git a/sources/properties/terminaldata.h b/sources/properties/terminaldata.h
index 6a716764c..f54344e61 100644
--- a/sources/properties/terminaldata.h
+++ b/sources/properties/terminaldata.h
@@ -27,9 +27,9 @@ class TerminalData : public PropertiesInterface
 
 		void setParent(QGraphicsObject* parent);
 		void toSettings(QSettings &settings,
-				const QString = QString()) const override;
+				const QString prefix = QString()) const override;
 		void fromSettings(const QSettings &settings,
-				  const QString = QString()) override;
+				  const QString prefix = QString()) override;
 		QDomElement toXml(QDomDocument &xml_element) const override;
 		bool fromXml(const QDomElement &xml_element) override;