diff --git a/compiler/semantic.py b/compiler/semantic.py
index d7e3c40..db0ccbe 100644
--- a/compiler/semantic.py
+++ b/compiler/semantic.py
@@ -131,6 +131,11 @@ class Context:
         if name in self.variables:
             raise SemanticAnalysisError(value.location())
 
+        upper_definition = self._get_symbol("variables", name)
+        if upper_definition is not None:
+            CompilationWarning(definition.location(),
+                               f"Shadowing previous definition {upper_definition.definition.location()}").raise_warning()
+
         typedef = self.get_type(type_identifier.value)
         if typedef is None:
             raise SemanticAnalysisError(location=type_identifier.location(),