diff --git a/apps/sequence/sequence.cpp b/apps/sequence/sequence.cpp
index 641c7fe0e..b284d39b3 100644
--- a/apps/sequence/sequence.cpp
+++ b/apps/sequence/sequence.cpp
@@ -179,11 +179,11 @@ Poincare::ExpressionLayout * Sequence::secondInitialConditionName() {
 bool Sequence::isDefined() {
   switch (m_type) {
     case Type::Explicite:
-      return layout() != nullptr;
+      return expression() != nullptr;
     case Type::SingleRecurrence:
-      return layout() != nullptr && m_firstInitialConditionLayout != nullptr;
+      return expression() != nullptr && m_firstInitialConditionExpression != nullptr;
     default:
-      return layout() != nullptr && m_firstInitialConditionLayout != nullptr && m_secondInitialConditionLayout != nullptr;
+      return expression() != nullptr && m_firstInitialConditionExpression != nullptr && m_secondInitialConditionExpression != nullptr;
   }
 }
 
diff --git a/apps/shared/function.cpp b/apps/shared/function.cpp
index b9f379ede..5c26d11fb 100644
--- a/apps/shared/function.cpp
+++ b/apps/shared/function.cpp
@@ -63,7 +63,7 @@ Poincare::ExpressionLayout * Function::layout() {
 }
 
 bool Function::isDefined() {
-  return m_layout != nullptr;
+  return m_expression != nullptr;
 }
 
 bool Function::isActive() {