diff --git a/escher/include/escher/expression_field.h b/escher/include/escher/expression_field.h
index 6d382f79d..522013f35 100644
--- a/escher/include/escher/expression_field.h
+++ b/escher/include/escher/expression_field.h
@@ -7,14 +7,12 @@
 #include <escher/text_field_delegate.h>
 #include <poincare/layout.h>
 
-class ExpressionField : public Responder, public View, public EditableField {
+class ExpressionField : public Responder, public View {
 public:
   ExpressionField(Responder * parentResponder, char * textBuffer, int textBufferLength, TextFieldDelegate * textFieldDelegate, LayoutFieldDelegate * layoutFieldDelegate);
 
-  void setEditing(bool isEditing, bool reinitDraftBuffer = true) override;
-  bool isEditing() const override;
-  char XNTChar(char defaultXNTChar) override;
-  bool shouldFinishEditing(Ion::Events::Event event) override;
+  void setEditing(bool isEditing, bool reinitDraftBuffer = true);
+  bool isEditing() const;
   /* Warning: this function is VERY dangerous! Indeed: sometimes the
    * m_layoutField might overflow the m_textBuffer once serialized
    * and still have been accepted before because the model can hold a longer
@@ -26,7 +24,7 @@ public:
   bool editionIsInTextField() const;
   bool isEmpty() const;
   bool heightIsMaximal() const;
-  bool handleEventWithText(const char * text, bool indentation = false, bool forceCursorRightOfText = false) override;
+  bool handleEventWithText(const char * text, bool indentation = false, bool forceCursorRightOfText = false);
 
   /* View */
   int numberOfSubviews() const override { return 1; }
diff --git a/escher/src/expression_field.cpp b/escher/src/expression_field.cpp
index 33ba38291..e4a1055d9 100644
--- a/escher/src/expression_field.cpp
+++ b/escher/src/expression_field.cpp
@@ -35,14 +35,6 @@ bool ExpressionField::isEditing() const {
   return editionIsInTextField() ? m_textField.isEditing() : m_layoutField.isEditing();
 }
 
-char ExpressionField::XNTChar(char defaultXNTChar) {
-  return editionIsInTextField() ? m_textField.XNTChar(defaultXNTChar) : m_layoutField.XNTChar(defaultXNTChar);
-}
-
-bool ExpressionField::shouldFinishEditing(Ion::Events::Event event) {
-  return editionIsInTextField() ? m_textField.shouldFinishEditing(event) : m_layoutField.shouldFinishEditing(event);
-}
-
 const char * ExpressionField::text() {
   if (!editionIsInTextField()) {
     m_layoutField.serialize(m_textBuffer, m_textBufferLength);