diff --git a/poincare/src/based_integer.cpp b/poincare/src/based_integer.cpp
index 1c58a3f96..b8783745e 100644
--- a/poincare/src/based_integer.cpp
+++ b/poincare/src/based_integer.cpp
@@ -87,11 +87,6 @@ BasedInteger BasedInteger::Builder(const Integer & m, Integer::Base base) {
 }
 
 Expression BasedInteger::shallowReduce() {
-  Expression e = Expression::defaultShallowReduce();
-  if (e.isUndefined()) {
-    return e;
-  }
-  // this = e
   // Turn BasedInteger into Rational
   Integer numerator = node()->integer();
   Integer denominator(1);
diff --git a/poincare/src/decimal.cpp b/poincare/src/decimal.cpp
index 224c776c0..da17e993d 100644
--- a/poincare/src/decimal.cpp
+++ b/poincare/src/decimal.cpp
@@ -448,11 +448,6 @@ Expression Decimal::setSign(ExpressionNode::Sign s) {
 }
 
 Expression Decimal::shallowReduce() {
-  Expression e = Expression::defaultShallowReduce();
-  if (e.isUndefined()) {
-    return e;
-  }
-  // this = e
   int exp = node()->exponent();
   Integer numerator = node()->signedMantissa();
   /* To avoid uselessly big numerator and denominator, we get rid of useless 0s