diff --git a/compiler/ast/ast.cpp b/compiler/ast/ast.cpp
index 5c339d9..f692f2f 100644
--- a/compiler/ast/ast.cpp
+++ b/compiler/ast/ast.cpp
@@ -2,7 +2,18 @@
 
 string ExprVar::linearize(CFG * cfg)
 {
-    return varName;
+    if(cfg->get_current_level() == cfg->get_level(varName)){
+        return varName;
+    }
+    else
+    {
+        // TODO:: Gérer les erreurs
+        /*
+        Error *error = new Error();
+        ErrorManager::addError(error);
+        */
+        return NULL;
+    }
 }
 
 string ExprConst::linearize(CFG * cfg)
diff --git a/compiler/intermediateRepresentation/CFG.cpp b/compiler/intermediateRepresentation/CFG.cpp
index f6f90b6..20fbaa8 100644
--- a/compiler/intermediateRepresentation/CFG.cpp
+++ b/compiler/intermediateRepresentation/CFG.cpp
@@ -1,4 +1,7 @@
 #include <iostream>
+#include <stdio.h>
+#include <string.h>
+
 using namespace std;
 
 #include "IR.h"
@@ -15,6 +18,24 @@ CFG::~CFG() {
     }
 }
 
+string CFG::get_current_level()
+{
+    return symbolTable->current_function;
+}
+
+string CFG::get_level(string varName)
+{
+    //Extract the number after the last "_" in the variable name (ex : a_1, or get_var_2).
+    string level;
+    string token = strtok(varName,"_");
+    while(token!= NULL)
+    {
+        level = token;
+        token = strtok(NULL, "-");
+    }
+    return level;
+}
+
 void CFG::add_bb(BasicBlock *bb)
 {
     current_bb = bb;
diff --git a/compiler/intermediateRepresentation/IR.h b/compiler/intermediateRepresentation/IR.h
index de0a0f9..2e63aff 100644
--- a/compiler/intermediateRepresentation/IR.h
+++ b/compiler/intermediateRepresentation/IR.h
@@ -160,6 +160,8 @@ class CFG
     void add_to_symbol_table(string name, TypeSymbol t, StateSymbol stateSymbol);
     string create_new_tempvar(TypeSymbol t);
     int get_var_index(string name);
+    string get_current_level();
+    string get_level(string varName);
     TypeSymbol get_var_type(string name);
     void assignSymbol(string name);
     bool isAssigneSymbol(string name);