diff --git a/poincare/include/poincare/parenthesis.h b/poincare/include/poincare/parenthesis.h
index 7668e86a1..047a05d61 100644
--- a/poincare/include/poincare/parenthesis.h
+++ b/poincare/include/poincare/parenthesis.h
@@ -16,6 +16,8 @@ private:
   Evaluation<float> * privateEvaluate(SinglePrecision p, Context& context, AngleUnit angleUnit) const override { return templatedEvaluate<float>(context, angleUnit); }
   Evaluation<double> * privateEvaluate(DoublePrecision p, Context& context, AngleUnit angleUnit) const override { return templatedEvaluate<double>(context, angleUnit); }
  template<typename T> Evaluation<T> * templatedEvaluate(Context& context, AngleUnit angleUnit) const;
+  /* Simplification */
+  void privateSimplify() override;
 };
 
 }
diff --git a/poincare/src/parenthesis.cpp b/poincare/src/parenthesis.cpp
index ac7d8b157..ec0912710 100644
--- a/poincare/src/parenthesis.cpp
+++ b/poincare/src/parenthesis.cpp
@@ -23,6 +23,10 @@ ExpressionLayout * Parenthesis::privateCreateLayout(FloatDisplayMode floatDispla
   return new ParenthesisLayout(operand(0)->createLayout(floatDisplayMode, complexFormat));
 }
 
+void Parenthesis::privateSimplify() {
+  replaceWith(const_cast<Expression *>(operand(0)), true);
+}
+
 template<typename T>
 Evaluation<T> * Parenthesis::templatedEvaluate(Context& context, AngleUnit angleUnit) const {
   return operand(0)->evaluate<T>(context, angleUnit);