diff --git a/sql/item_func.cc b/sql/item_func.cc
index b5e70ac84ef..6ff743ed91d 100644
--- a/sql/item_func.cc
+++ b/sql/item_func.cc
@@ -5802,7 +5802,7 @@ Item_func_sp::cleanup()
     sp_result_field= NULL;
   }
   m_sp= NULL;
-  dummy_table->alias= NULL;
+  dummy_table->alias.free();
   Item_func::cleanup();
 }