diff --git a/sql/sql_select.cc b/sql/sql_select.cc
index 5f4881b2f54..673ce8b1573 100644
--- a/sql/sql_select.cc
+++ b/sql/sql_select.cc
@@ -391,6 +391,7 @@ POSITION::POSITION()
   range_rowid_filter_info= 0;
   ref_depend_map= dups_producing_tables= 0;
   inner_tables_handled_with_other_sjs= 0;
+  type= JT_UNKNOWN;
   dups_weedout_picker.set_empty();
   firstmatch_picker.set_empty();
   loosescan_picker.set_empty();