diff --git a/apps/graph/app.cpp b/apps/graph/app.cpp
index dffce42f6..55ec6262c 100644
--- a/apps/graph/app.cpp
+++ b/apps/graph/app.cpp
@@ -86,4 +86,8 @@ Context * App::localContext() {
   return TextFieldDelegateApp::localContext();
 }
 
+const char * App::XNT() {
+  return "x";
+}
+
 }
diff --git a/apps/graph/app.h b/apps/graph/app.h
index 2f8bd7cc7..5ac2f36ff 100644
--- a/apps/graph/app.h
+++ b/apps/graph/app.h
@@ -38,6 +38,7 @@ public:
    * use a temporary local context (on the stack). That way, we avoid keeping
    * weird x values after drawing curves or displaying the value table. */
   Poincare::Context * localContext() override;
+  const char * XNT() override;
 private:
   App(Container * container, Snapshot * snapshot);
   Poincare::VariableContext<float> m_xContext;
diff --git a/apps/shared/text_field_delegate_app.cpp b/apps/shared/text_field_delegate_app.cpp
index 5ef401fdc..53f902209 100644
--- a/apps/shared/text_field_delegate_app.cpp
+++ b/apps/shared/text_field_delegate_app.cpp
@@ -22,7 +22,7 @@ AppsContainer * TextFieldDelegateApp::container() {
 }
 
 const char * TextFieldDelegateApp::XNT() {
-  return "x";
+  return "X";
 }
 
 const char * TextFieldDelegateApp::privateXNT(TextField * textField) {