diff --git a/sql/sql_lex.cc b/sql/sql_lex.cc
index bd81aa2d5c1..59bed09aa28 100644
--- a/sql/sql_lex.cc
+++ b/sql/sql_lex.cc
@@ -1770,7 +1770,7 @@ void Query_tables_list::destroy_query_tables_list()
 
 st_lex::st_lex()
   :result(0), yacc_yyss(0), yacc_yyvs(0),
-   sql_command(SQLCOM_END)
+   sql_command(SQLCOM_END), option_type(OPT_DEFAULT)
 {
   /* Check that plugins_static_buffer is declared immediately after plugins */
   compile_time_assert((&plugins + 1) == (DYNAMIC_ARRAY*)plugins_static_buffer);