diff --git a/apps/sequence/sequence.cpp b/apps/sequence/sequence.cpp
index ded5f3660..359ccb34a 100644
--- a/apps/sequence/sequence.cpp
+++ b/apps/sequence/sequence.cpp
@@ -253,10 +253,10 @@ T Sequence::approximateToNextRank(int n, SequenceContext * sqctx) const {
   T vn = sqctx->valueOfSequenceAtPreviousRank<T>(1, 0);
   T vnm1 = sqctx->valueOfSequenceAtPreviousRank<T>(1, 1);
   T vnm2 = sqctx->valueOfSequenceAtPreviousRank<T>(1, 2);
-  Poincare::Symbol vnSymbol("v(n)");
-  Poincare::Symbol vn1Symbol("v(n+1)");
-  Poincare::Symbol unSymbol("u(n)");
-  Poincare::Symbol un1Symbol("u(n+1)");
+  Poincare::Symbol vnSymbol("v(n)", 4);
+  Poincare::Symbol vn1Symbol("v(n+1)", 6);
+  Poincare::Symbol unSymbol("u(n)", 4);
+  Poincare::Symbol un1Symbol("u(n+1)", 6);
   Preferences * preferences = Poincare::Preferences::sharedPreferences();
   switch (m_type) {
     case Type::Explicit:
diff --git a/poincare/include/poincare/symbol.h b/poincare/include/poincare/symbol.h
index 222ea46fb..4ea1e7dce 100644
--- a/poincare/include/poincare/symbol.h
+++ b/poincare/include/poincare/symbol.h
@@ -71,7 +71,7 @@ public:
      * characters but events as 'end of text', 'backspace'... */
     UnknownX = 1,
   };
-  Symbol(const char * name = "", int length = 0);
+  Symbol(const char * name, int length);
   Symbol(char name);
   Symbol(const SymbolNode * node) : Expression(node) {}
 
diff --git a/poincare/src/symbol.cpp b/poincare/src/symbol.cpp
index 094ee332f..2da879290 100644
--- a/poincare/src/symbol.cpp
+++ b/poincare/src/symbol.cpp
@@ -152,7 +152,7 @@ Evaluation<T> SymbolNode::templatedApproximate(Context& context, Preferences::An
     assert(m_name[1] == 0);
     return Complex<T>(0.0, 1.0);
   }
-  const Expression e = context.expressionForSymbol(Symbol(m_name));
+  const Expression e = context.expressionForSymbol(Symbol(this));
   if (e.isUninitialized()) {
     return Complex<T>::Undefined();
   }