diff --git a/apps/calculation/app.cpp b/apps/calculation/app.cpp
index 08d23b4bb..077fcc75d 100644
--- a/apps/calculation/app.cpp
+++ b/apps/calculation/app.cpp
@@ -27,6 +27,8 @@ App * App::Snapshot::unpack(Container * container) {
 
 void App::Snapshot::reset() {
   m_calculationStore.deleteAll();
+  m_cacheBuffer[0] = 0;
+  m_cacheBufferInformation = 0;
 }
 
 App::Descriptor * App::Snapshot::descriptor() {
@@ -41,7 +43,7 @@ App::Snapshot::Snapshot() : m_calculationStore(m_calculationBuffer, k_calculatio
 App::App(Snapshot * snapshot) :
   ExpressionFieldDelegateApp(snapshot, &m_editExpressionController),
   m_historyController(&m_editExpressionController, snapshot->calculationStore()),
-  m_editExpressionController(&m_modalViewController, this, &m_historyController, snapshot->calculationStore())
+  m_editExpressionController(&m_modalViewController, this, snapshot->cacheBuffer(), snapshot->cacheBufferInformationAddress(), &m_historyController, snapshot->calculationStore())
 {
 }
 
diff --git a/apps/calculation/app.h b/apps/calculation/app.h
index 6914c82df..eaa0040fa 100644
--- a/apps/calculation/app.h
+++ b/apps/calculation/app.h
@@ -24,11 +24,15 @@ public:
     void reset() override;
     Descriptor * descriptor() override;
     CalculationStore * calculationStore() { return &m_calculationStore; }
+    char * cacheBuffer() { return m_cacheBuffer; }
+    size_t * cacheBufferInformationAddress() { return &m_cacheBufferInformation; }
   private:
     CalculationStore m_calculationStore;
     // Set the size of the buffer needed to store the calculations
     static constexpr int k_calculationBufferSize = 10 * (sizeof(Calculation) + Calculation::k_numberOfExpressions * Constant::MaxSerializedExpressionSize + sizeof(Calculation *));
     char m_calculationBuffer[k_calculationBufferSize];
+    char m_cacheBuffer[EditExpressionController::k_cacheBufferSize];
+    size_t m_cacheBufferInformation;
   };
   static App * app() {
     return static_cast<App *>(Container::activeApp());
diff --git a/apps/calculation/edit_expression_controller.cpp b/apps/calculation/edit_expression_controller.cpp
index 2ae7929a9..060042c6e 100644
--- a/apps/calculation/edit_expression_controller.cpp
+++ b/apps/calculation/edit_expression_controller.cpp
@@ -38,13 +38,14 @@ void EditExpressionController::ContentView::reload() {
   markRectAsDirty(bounds());
 }
 
-EditExpressionController::EditExpressionController(Responder * parentResponder, InputEventHandlerDelegate * inputEventHandlerDelegate, HistoryController * historyController, CalculationStore * calculationStore) :
+EditExpressionController::EditExpressionController(Responder * parentResponder, InputEventHandlerDelegate * inputEventHandlerDelegate, char * cacheBuffer, size_t * cacheBufferInformation, HistoryController * historyController, CalculationStore * calculationStore) :
   ViewController(parentResponder),
+  m_cacheBuffer(cacheBuffer),
+  m_cacheBufferInformation(cacheBufferInformation),
   m_historyController(historyController),
   m_calculationStore(calculationStore),
   m_contentView(this, static_cast<CalculationSelectableTableView *>(m_historyController->view()), inputEventHandlerDelegate, this, this)
 {
-  m_cacheBuffer[0] = 0;
 }
 
 void EditExpressionController::insertTextBody(const char * text) {
diff --git a/apps/calculation/edit_expression_controller.h b/apps/calculation/edit_expression_controller.h
index 1605f8b8d..cea45b339 100644
--- a/apps/calculation/edit_expression_controller.h
+++ b/apps/calculation/edit_expression_controller.h
@@ -14,7 +14,17 @@ namespace Calculation {
 /* TODO: implement a split view */
 class EditExpressionController : public ViewController, public Shared::TextFieldDelegate, public Shared::LayoutFieldDelegate {
 public:
-  EditExpressionController(Responder * parentResponder, InputEventHandlerDelegate * inputEventHandlerDelegate, HistoryController * historyController, CalculationStore * calculationStore);
+  EditExpressionController(Responder * parentResponder, InputEventHandlerDelegate * inputEventHandlerDelegate, char * cacheBuffer, size_t * cacheBufferInformation, HistoryController * historyController, CalculationStore * calculationStore);
+
+  /* k_layoutBufferMaxSize dictates the size under which the expression being
+   * edited can be remembered when the user leaves Calculation. */
+  static constexpr int k_layoutBufferMaxSize = 1024;
+  /* k_cacheBufferSize is the size of the array to which m_cacheBuffer points.
+   * It is used both as a way to buffer expression when pushing them the
+   * CalculationStore, and as a storage for the current input when leaving the
+   * application. */
+  static constexpr int k_cacheBufferSize = (k_layoutBufferMaxSize < Constant::MaxSerializedExpressionSize) ? Constant::MaxSerializedExpressionSize : k_layoutBufferMaxSize;
+
   View * view() override { return &m_contentView; }
   void didBecomeFirstResponder() override;
   void viewWillAppear() override;
@@ -49,8 +59,8 @@ private:
   bool inputViewDidReceiveEvent(Ion::Events::Event event, bool shouldDuplicateLastCalculation);
   bool inputViewDidFinishEditing(const char * text, Poincare::Layout layoutR);
   bool inputViewDidAbortEditing(const char * text);
-  static constexpr int k_cacheBufferSize = Constant::MaxSerializedExpressionSize;
-  char m_cacheBuffer[k_cacheBufferSize];
+  char * m_cacheBuffer;
+  size_t * m_cacheBufferInformation;
   HistoryController * m_historyController;
   CalculationStore * m_calculationStore;
   ContentView m_contentView;