diff --git a/apps/graph/graph/graph_controller_helper.cpp b/apps/graph/graph/graph_controller_helper.cpp
index 5a9d64369..6d276e3d4 100644
--- a/apps/graph/graph/graph_controller_helper.cpp
+++ b/apps/graph/graph/graph_controller_helper.cpp
@@ -27,11 +27,9 @@ bool GraphControllerHelper::privateMoveCursorHorizontally(Shared::CurveViewCurso
   }
   if (type == CartesianFunction::PlotType::Cartesian) {
     t+= dir * range->xGridUnit()/numberOfStepsInGradUnit;
-  } else if (type == CartesianFunction::PlotType::Polar) {
-    t += dir; //TODO LEA delt
   } else {
-    assert(type == CartesianFunction::PlotType::Parametric);
-    t += dir; //TODO LEA delt
+    assert(type == CartesianFunction::PlotType::Polar || type == CartesianFunction::PlotType::Parametric);
+    t += dir * (tMax-tMin)/k_definitionDomainDivisor;
   }
   t = maxFloat(minFloat(t, tMax), tMin); // Stay inside the definition domain
   Coordinate2D<double> xy = function->evaluateXYAtParameter(t, App::app()->localContext());
diff --git a/apps/graph/graph/graph_controller_helper.h b/apps/graph/graph/graph_controller_helper.h
index 9b0ecedf7..2a143e76f 100644
--- a/apps/graph/graph/graph_controller_helper.h
+++ b/apps/graph/graph/graph_controller_helper.h
@@ -14,6 +14,8 @@ protected:
   bool privateMoveCursorHorizontally(Shared::CurveViewCursor * cursor, int direction, Shared::InteractiveCurveViewRange * range, int numberOfStepsInGradUnit, Ion::Storage::Record record);
   void reloadDerivativeInBannerViewForCursorOnFunction(Shared::CurveViewCursor * cursor, Ion::Storage::Record record);
   virtual BannerView * bannerView() = 0;
+private:
+  static constexpr double k_definitionDomainDivisor = 96.0;
 };
 
 }