diff --git a/poincare/src/variable_context.cpp b/poincare/src/variable_context.cpp
index 448fead7b..858f18c58 100644
--- a/poincare/src/variable_context.cpp
+++ b/poincare/src/variable_context.cpp
@@ -31,7 +31,7 @@ void VariableContext::setExpressionForSymbol(const Expression & expression, cons
 
 const Expression VariableContext::expressionForSymbol(const SymbolAbstract & symbol) {
   if (strcmp(symbol.name(), m_name) == 0) {
-    return m_value;
+    return m_value.clone();
   } else {
     return m_parentContext->expressionForSymbol(symbol);
   }