diff --git a/guilib/include/rtabmap/gui/PreferencesDialog.h b/guilib/include/rtabmap/gui/PreferencesDialog.h
index f3f7224b..214200f3 100644
--- a/guilib/include/rtabmap/gui/PreferencesDialog.h
+++ b/guilib/include/rtabmap/gui/PreferencesDialog.h
@@ -264,7 +264,7 @@ protected:
 	virtual void writeCameraSettings(const QString & filePath = QString()) const;
 	virtual void writeCoreSettings(const QString & filePath = QString()) const;
 
-	QString getTmpIniFilePath() const;
+	virtual QString getTmpIniFilePath() const;
 
 private:
 	bool validateForm();