diff --git a/poincare/src/addition.cpp b/poincare/src/addition.cpp
index f7b2e3474..bb19995a0 100644
--- a/poincare/src/addition.cpp
+++ b/poincare/src/addition.cpp
@@ -98,7 +98,7 @@ void Addition::immediateBeautify() {
   int index = 0;
   while (index < numberOfOperands()) {
     // a+(-1)*b+... -> a-b+...
-    if (operand(index)->type() == Type::Multiplication && static_cast<const Multiplication *>(operand(index))->operand(0)->type() == Type::Rational && static_cast<const Rational *>(operand(index)->operand(0))->isMinusOne()) {
+    if (operand(index)->type() == Type::Multiplication && operand(index)->operand(0)->type() == Type::Rational && static_cast<const Rational *>(operand(index)->operand(0))->isMinusOne()) {
       Multiplication * m = static_cast<Multiplication *>((Expression *)operand(index));
       m->removeOperand(m->operand(0), true);
       m->squashUnaryHierarchy();