diff --git a/src/Binder/BoundExpressions/BoundExpression.hpp b/src/Binder/BoundExpressions/BoundExpression.hpp
index 60967d9..ff08fe4 100644
--- a/src/Binder/BoundExpressions/BoundExpression.hpp
+++ b/src/Binder/BoundExpressions/BoundExpression.hpp
@@ -141,7 +141,9 @@ public:
         _key = key;
     }
 
-    ~BoundVariableExpression() override = default;
+    ~BoundVariableExpression() override{
+        delete _key;
+    }
 
     BoundExpressionKind GetKind() final{
         return BoundExpressionKind ::Variable;