diff --git a/apps/graph/graph/graph_controller.cpp b/apps/graph/graph/graph_controller.cpp
index 08c4ca80b..caf46381a 100644
--- a/apps/graph/graph/graph_controller.cpp
+++ b/apps/graph/graph/graph_controller.cpp
@@ -39,7 +39,7 @@ void GraphController::setDisplayDerivativeInBanner(bool displayDerivative) {
   m_displayDerivativeInBanner = displayDerivative;
 }
 
-float GraphController::interestingXHalfRange() {
+float GraphController::interestingXHalfRange() const {
   float characteristicRange = 0.0f;
   TextFieldDelegateApp * myApp = (TextFieldDelegateApp *)app();
   for (int i = 0; i < functionStore()->numberOfActiveFunctions(); i++) {
diff --git a/apps/graph/graph/graph_controller.h b/apps/graph/graph/graph_controller.h
index bdf5ad861..58586d727 100644
--- a/apps/graph/graph/graph_controller.h
+++ b/apps/graph/graph/graph_controller.h
@@ -20,7 +20,7 @@ public:
   void viewWillAppear() override;
   bool displayDerivativeInBanner() const;
   void setDisplayDerivativeInBanner(bool displayDerivative);
-  float interestingXHalfRange() override;
+  float interestingXHalfRange() const override;
 private:
   int estimatedBannerNumberOfLines() const override;
   void selectFunctionWithCursor(int functionIndex) override;
diff --git a/apps/sequence/graph/graph_controller.cpp b/apps/sequence/graph/graph_controller.cpp
index cd5e42c31..92db25c1a 100644
--- a/apps/sequence/graph/graph_controller.cpp
+++ b/apps/sequence/graph/graph_controller.cpp
@@ -29,7 +29,7 @@ I18n::Message GraphController::emptyMessage() {
   return I18n::Message::NoActivatedSequence;
 }
 
-float GraphController::interestingXMin() {
+float GraphController::interestingXMin() const {
   int nmin = INT_MAX;
   for (int i = 0; i < m_sequenceStore->numberOfModels(); i++) {
     Sequence * s = m_sequenceStore->modelAtIndex(i);
@@ -41,7 +41,7 @@ float GraphController::interestingXMin() {
   return nmin;
 }
 
-float GraphController::interestingXHalfRange() {
+float GraphController::interestingXHalfRange() const {
   float standardRange = Shared::FunctionGraphController::interestingXHalfRange();
   int nmin = INT_MAX;
   int nmax = 0;
diff --git a/apps/sequence/graph/graph_controller.h b/apps/sequence/graph/graph_controller.h
index 52dedbaae..b8579a776 100644
--- a/apps/sequence/graph/graph_controller.h
+++ b/apps/sequence/graph/graph_controller.h
@@ -18,8 +18,8 @@ public:
   I18n::Message emptyMessage() override;
   TermSumController * termSumController() { return &m_termSumController; }
   // InteractiveCurveViewRangeDelegate
-  float interestingXMin() override;
-  float interestingXHalfRange() override;
+  float interestingXMin() const override;
+  float interestingXHalfRange() const override;
 protected:
   int numberOfCurves() const override { return m_sequenceStore->numberOfModels(); }
 private:
diff --git a/apps/shared/interactive_curve_view_range_delegate.h b/apps/shared/interactive_curve_view_range_delegate.h
index 62ae00a96..b7193ebd1 100644
--- a/apps/shared/interactive_curve_view_range_delegate.h
+++ b/apps/shared/interactive_curve_view_range_delegate.h
@@ -8,8 +8,8 @@ class InteractiveCurveViewRange;
 class InteractiveCurveViewRangeDelegate {
 public:
   bool didChangeRange(InteractiveCurveViewRange * interactiveCurveViewRange);
-  virtual float interestingXMin() { return -interestingXHalfRange(); }
-  virtual float interestingXHalfRange() { return 10.0f; }
+  virtual float interestingXMin() const { return -interestingXHalfRange(); }
+  virtual float interestingXHalfRange() const { return 10.0f; }
 protected:
   struct Range {
     float min;