diff --git a/GUI/Model/Descriptor/ComboProperty.cpp b/GUI/Model/Descriptor/ComboProperty.cpp
index 8ce95d9db5e121d6b36333224615da855ebaa301..38e5d7366f2e6fff828edec8bad7f7e74ea571f3 100644
--- a/GUI/Model/Descriptor/ComboProperty.cpp
+++ b/GUI/Model/Descriptor/ComboProperty.cpp
@@ -91,22 +91,6 @@ void ComboProperty::setCurrentIndex(int index)
     m_selected_indices.push_back(index);
 }
 
-ComboProperty& ComboProperty::operator<<(const QString& str)
-{
-    m_values.append(str);
-    if (!m_values.empty())
-        setCurrentIndex(0);
-    return *this;
-}
-
-ComboProperty& ComboProperty::operator<<(const QStringList& str)
-{
-    m_values.append(str);
-    if (!m_values.empty())
-        setCurrentIndex(0);
-    return *this;
-}
-
 //! Constructs variant enclosing given ComboProperty.
 
 QVariant ComboProperty::variant() const
diff --git a/GUI/Model/Descriptor/ComboProperty.h b/GUI/Model/Descriptor/ComboProperty.h
index 7b3183dbfd30552b2ac7ffdc4cd626c315c8c129..3f194df4fc7ac68c9197a7cb51b361da9a71a51f 100644
--- a/GUI/Model/Descriptor/ComboProperty.h
+++ b/GUI/Model/Descriptor/ComboProperty.h
@@ -43,9 +43,6 @@ public:
     int currentIndex() const;
     void setCurrentIndex(int index);
 
-    ComboProperty& operator<<(const QString& str);
-    ComboProperty& operator<<(const QStringList& str);
-
     QVariant variant() const;
 
     void setSelected(int index, bool value = true);