diff --git a/sql/item.h b/sql/item.h
index c17aabf797cd634349a3dd490292871c583038eb..68fa013647c682a6aceb1897ff8f6bff5fbebb86 100644
--- a/sql/item.h
+++ b/sql/item.h
@@ -144,6 +144,7 @@ public:
     DBUG_ENTER("Item::cleanup");
     DBUG_PRINT("info", ("Type: %d", (int)type()));
     fixed=0;
+    marker= 0;
     DBUG_VOID_RETURN;
   }
   virtual void make_field(Send_field *field);