diff --git a/poincare/src/layout/fraction_layout.cpp b/poincare/src/layout/fraction_layout.cpp
index 2fa2914c9..15da4a5ef 100644
--- a/poincare/src/layout/fraction_layout.cpp
+++ b/poincare/src/layout/fraction_layout.cpp
@@ -28,7 +28,7 @@ void FractionLayout::render(KDPoint point) {
   KDDrawLine(
       KDPointMake(point.x, fractionLineY),
       KDPointMake(point.x + size().width, fractionLineY),
-      0);
+      0xFF);
 }
 
 KDSize FractionLayout::computeSize() {