diff --git a/poincare/src/simplify/expression_builder.cpp b/poincare/src/simplify/expression_builder.cpp
index bab34ca4c..5c64c8587 100644
--- a/poincare/src/simplify/expression_builder.cpp
+++ b/poincare/src/simplify/expression_builder.cpp
@@ -40,6 +40,7 @@ Expression * ExpressionBuilder::build(ExpressionMatch matches[]) {
           assert(false);
           break;
       }
+      break;
     case ExpressionBuilder::Action::BuildFromTypeAndValue:
       switch(m_expressionType) {
         case Expression::Type::Integer:
diff --git a/poincare/src/simplify/expression_builder.h b/poincare/src/simplify/expression_builder.h
index 2d2202a6a..f9af7237e 100644
--- a/poincare/src/simplify/expression_builder.h
+++ b/poincare/src/simplify/expression_builder.h
@@ -27,6 +27,7 @@ private:
     CallExternalGenerator
   };
 
+  constexpr ExpressionBuilder(Expression::Type type, uint8_t numberOfChildren);
   constexpr ExpressionBuilder(Expression::Type type, int32_t integerValue, uint8_t numberOfChildren);
   constexpr ExpressionBuilder(Action action, uint8_t matchIndex, uint8_t numberOfChildren);
   constexpr ExpressionBuilder(ExternalGenerator * generator, uint8_t numberOfChildren);
@@ -59,8 +60,9 @@ private:
 constexpr ExpressionBuilder ExpressionBuilder::BuildFromType(
   Expression::Type type,
   uint8_t numberOfChildren) {
-  return ExpressionBuilder(type, 0, numberOfChildren);
+  return ExpressionBuilder(type, numberOfChildren);
 }
+
 constexpr ExpressionBuilder ExpressionBuilder::BuildFromTypeAndValue(
   Expression::Type type,
   int32_t value,
@@ -86,6 +88,15 @@ constexpr ExpressionBuilder ExpressionBuilder::CallExternalGenerator(
   return ExpressionBuilder(generator, numberOfChildren);
 }
 
+constexpr ExpressionBuilder::ExpressionBuilder(Expression::Type type,
+  uint8_t numberOfChildren)
+  :
+  m_action(ExpressionBuilder::Action::BuildFromType),
+  m_expressionType(type),
+  m_integerValue(0),
+  m_numberOfChildren(numberOfChildren) {
+}
+
 constexpr ExpressionBuilder::ExpressionBuilder(Expression::Type type,
   int32_t integerValue,
   uint8_t numberOfChildren)
diff --git a/poincare/src/simplify/rules.pr b/poincare/src/simplify/rules.pr
index 6a68c4905..77a59e2ef 100644
--- a/poincare/src/simplify/rules.pr
+++ b/poincare/src/simplify/rules.pr
@@ -1,3 +1,3 @@
-Integer(a)->Integer(a);
-Addition(Addition(a,b),c)->Addition(a,b,c);
 Addition(Addition(a*),b*)->Addition(a*,b*);
+Addition(Integer.a,Integer.b)->$AddIntegers(a,b);
+Addition(Integer.a,Integer.b,c*)->Addition($AddIntegers(a,b),c*);