diff --git a/poincare/src/layout/fraction_layout.cpp b/poincare/src/layout/fraction_layout.cpp
index f1c612b9c..d81ba547a 100644
--- a/poincare/src/layout/fraction_layout.cpp
+++ b/poincare/src/layout/fraction_layout.cpp
@@ -230,7 +230,7 @@ ExpressionLayout * FractionLayout::layoutToPointWhenInserting() {
 
 void FractionLayout::render(KDContext * ctx, KDPoint p, KDColor expressionColor, KDColor backgroundColor) {
   KDCoordinate fractionLineY = p.y() + numeratorLayout()->size().height() + k_fractionLineMargin;
-  ctx->fillRect(KDRect(p.x()+Metric::FractionAndConjugateHorizontalMargin, fractionLineY, size().width()-2*Metric::FractionAndConjugateHorizontalMargin, 1), expressionColor);
+  ctx->fillRect(KDRect(p.x()+Metric::FractionAndConjugateHorizontalMargin, fractionLineY, size().width()-2*Metric::FractionAndConjugateHorizontalMargin, k_fractionLineHeight), expressionColor);
 }
 
 KDSize FractionLayout::computeSize() {
diff --git a/poincare/src/layout/fraction_layout.h b/poincare/src/layout/fraction_layout.h
index 1ed0becba..c3008171c 100644
--- a/poincare/src/layout/fraction_layout.h
+++ b/poincare/src/layout/fraction_layout.h
@@ -31,7 +31,7 @@ protected:
   KDPoint positionOfChild(ExpressionLayout * child) override;
 private:
   constexpr static KDCoordinate k_fractionLineMargin = 2;
-  constexpr static KDCoordinate k_fractionLineHeight = 2;
+  constexpr static KDCoordinate k_fractionLineHeight = 1;
   ExpressionLayout * numeratorLayout();
   ExpressionLayout * denominatorLayout();
 };