diff --git a/poincare/include/poincare/parenthesis_layout.h b/poincare/include/poincare/parenthesis_layout.h
index 5cc757d03..f35679205 100644
--- a/poincare/include/poincare/parenthesis_layout.h
+++ b/poincare/include/poincare/parenthesis_layout.h
@@ -27,7 +27,6 @@ public:
 #endif
 
 protected:
-  static KDColor s_parenthesisWorkingBuffer[k_parenthesisCurveHeight*k_parenthesisCurveWidth];
   KDSize computeSize() override {
     return KDSize(ParenthesisWidth(), HeightGivenChildHeight(childHeight()));
   }
diff --git a/poincare/src/left_parenthesis_layout.cpp b/poincare/src/left_parenthesis_layout.cpp
index 8ddd2dea5..31b28e1db 100644
--- a/poincare/src/left_parenthesis_layout.cpp
+++ b/poincare/src/left_parenthesis_layout.cpp
@@ -25,20 +25,21 @@ const uint8_t bottomLeftCurve[ParenthesisLayoutNode::k_parenthesisCurveHeight][P
 };
 
 void LeftParenthesisLayoutNode::RenderWithChildHeight(KDCoordinate childHeight, KDContext * ctx, KDPoint p, KDColor expressionColor, KDColor backgroundColor) {
+  KDColor parenthesisWorkingBuffer[k_parenthesisCurveHeight*k_parenthesisCurveWidth];
   KDCoordinate parenthesisHeight = ParenthesisLayoutNode::HeightGivenChildHeight(childHeight);
   KDRect frame(p.x()+ParenthesisLayoutNode::k_externWidthMargin,
       p.y()+ParenthesisLayoutNode::k_externHeightMargin,
       ParenthesisLayoutNode::k_parenthesisCurveWidth,
       ParenthesisLayoutNode::k_parenthesisCurveHeight);
 
-  ctx->blendRectWithMask(frame, expressionColor, (const uint8_t *)topLeftCurve, (KDColor *)(ParenthesisLayoutNode::s_parenthesisWorkingBuffer));
+  ctx->blendRectWithMask(frame, expressionColor, (const uint8_t *)topLeftCurve, parenthesisWorkingBuffer);
 
   frame = KDRect(p.x()+ParenthesisLayoutNode::k_externWidthMargin,
       p.y() + parenthesisHeight - ParenthesisLayoutNode::k_parenthesisCurveHeight - ParenthesisLayoutNode::k_externHeightMargin,
       ParenthesisLayoutNode::k_parenthesisCurveWidth,
       ParenthesisLayoutNode::k_parenthesisCurveHeight);
 
-  ctx->blendRectWithMask(frame, expressionColor, (const uint8_t *)bottomLeftCurve, (KDColor *)(ParenthesisLayoutNode::s_parenthesisWorkingBuffer));
+  ctx->blendRectWithMask(frame, expressionColor, (const uint8_t *)bottomLeftCurve, parenthesisWorkingBuffer);
 
   ctx->fillRect(KDRect(p.x()+ParenthesisLayoutNode::k_externWidthMargin,
         p.y()+ParenthesisLayoutNode::k_parenthesisCurveHeight+ParenthesisLayoutNode::k_externHeightMargin,
diff --git a/poincare/src/parenthesis_layout.cpp b/poincare/src/parenthesis_layout.cpp
index 40c5fc263..dece3d9d9 100644
--- a/poincare/src/parenthesis_layout.cpp
+++ b/poincare/src/parenthesis_layout.cpp
@@ -2,6 +2,4 @@
 
 namespace Poincare {
 
-KDColor ParenthesisLayoutNode::s_parenthesisWorkingBuffer[];
-
 }
diff --git a/poincare/src/right_parenthesis_layout.cpp b/poincare/src/right_parenthesis_layout.cpp
index d38345f20..35b9c1527 100644
--- a/poincare/src/right_parenthesis_layout.cpp
+++ b/poincare/src/right_parenthesis_layout.cpp
@@ -25,20 +25,21 @@ const uint8_t bottomRightCurve[ParenthesisLayoutNode::k_parenthesisCurveHeight][
 };
 
 void RightParenthesisLayoutNode::RenderWithChildHeight(KDCoordinate childHeight, KDContext * ctx, KDPoint p, KDColor expressionColor, KDColor backgroundColor) {
+  KDColor parenthesisWorkingBuffer[k_parenthesisCurveHeight*k_parenthesisCurveWidth];
   KDCoordinate parenthesisHeight = ParenthesisLayoutNode::HeightGivenChildHeight(childHeight);
   KDRect frame = KDRect(p.x() + ParenthesisLayoutNode::k_widthMargin + ParenthesisLayoutNode::k_lineThickness - ParenthesisLayoutNode::k_parenthesisCurveWidth,
       p.y() + ParenthesisLayoutNode::k_externHeightMargin,
       ParenthesisLayoutNode::k_parenthesisCurveWidth,
       ParenthesisLayoutNode::k_parenthesisCurveHeight);
 
-  ctx->blendRectWithMask(frame, expressionColor, (const uint8_t *)topRightCurve, (KDColor *)(ParenthesisLayoutNode::s_parenthesisWorkingBuffer));
+  ctx->blendRectWithMask(frame, expressionColor, (const uint8_t *)topRightCurve, parenthesisWorkingBuffer);
 
   frame = KDRect(p.x() + ParenthesisLayoutNode::k_widthMargin + ParenthesisLayoutNode::k_lineThickness - ParenthesisLayoutNode::k_parenthesisCurveWidth,
     p.y() + parenthesisHeight - ParenthesisLayoutNode::k_parenthesisCurveHeight - ParenthesisLayoutNode::k_externHeightMargin,
     ParenthesisLayoutNode::k_parenthesisCurveWidth,
     ParenthesisLayoutNode::k_parenthesisCurveHeight);
 
-  ctx->blendRectWithMask(frame, expressionColor, (const uint8_t *)bottomRightCurve, (KDColor *)(ParenthesisLayoutNode::s_parenthesisWorkingBuffer));
+  ctx->blendRectWithMask(frame, expressionColor, (const uint8_t *)bottomRightCurve, parenthesisWorkingBuffer);
 
   ctx->fillRect(KDRect(p.x()+ParenthesisLayoutNode::k_widthMargin,
         p.y()+ParenthesisLayoutNode::k_parenthesisCurveHeight+2,
diff --git a/poincare/src/trigonometry_cheat_table.cpp b/poincare/src/trigonometry_cheat_table.cpp
index eac4f3a4b..c0e02ba82 100644
--- a/poincare/src/trigonometry_cheat_table.cpp
+++ b/poincare/src/trigonometry_cheat_table.cpp
@@ -82,7 +82,7 @@ Expression TrigonometryCheatTable::simplify(const Expression e, ExpressionNode::
  * For instance, when simplfy a Cosine, we always compute the value for an angle
  * in the top right trigonometric quadrant. */
 const TrigonometryCheatTable * TrigonometryCheatTable::Table() {
-  static Row sTableRows[] = {
+  static const Row sTableRows[] = {
     Row(Row::Pair("-90", -90.0f),
         Row::Pair("π*(-2)^(-1)", -1.5707963267948966f),
         Row::Pair("-100", -100.0f),
@@ -306,7 +306,7 @@ const TrigonometryCheatTable * TrigonometryCheatTable::Table() {
         Row::Pair("0",0.0f),
         Row::Pair("0",0.0f))
   };
-  static TrigonometryCheatTable sTable(sTableRows);
+  static const TrigonometryCheatTable sTable(sTableRows);
   return &sTable;
 }