diff --git a/poincare/include/poincare/opposite.h b/poincare/include/poincare/opposite.h
index 7cdd716db..54a412935 100644
--- a/poincare/include/poincare/opposite.h
+++ b/poincare/include/poincare/opposite.h
@@ -44,7 +44,7 @@ public:
   int serialize(char * buffer, int bufferSize, Preferences::PrintFloatMode floatDisplayMode = Preferences::PrintFloatMode::Decimal, int numberOfSignificantDigits = 0) const override;
 
   // Simplification
-  Expression shallowReduce(Context& context, Preferences::AngleUnit angleUnit, const Expression futureParent = Expression()) override;
+  Expression shallowReduce(Context& context, Preferences::AngleUnit angleUnit, const Expression futureParent) override;
 };
 
 class Opposite : public Expression {
diff --git a/poincare/src/opposite.cpp b/poincare/src/opposite.cpp
index b443a3092..84028be6c 100644
--- a/poincare/src/opposite.cpp
+++ b/poincare/src/opposite.cpp
@@ -63,8 +63,8 @@ int OppositeNode::serialize(char * buffer, int bufferSize, Preferences::PrintFlo
   return numberOfChar;
 }
 
-Expression OppositeNode::shallowReduce(Context& context, Preferences::AngleUnit angleUnit) {
-  return Opposite(this).shallowReduce(context, angleUnit);
+Expression OppositeNode::shallowReduce(Context& context, Preferences::AngleUnit angleUnit, const Expression futureParent) {
+  return Opposite(this).shallowReduce(context, angleUnit, futureParent);
 }
 
 /* Simplification */