diff --git a/sql/sql_select.cc b/sql/sql_select.cc
index d82a0fdcf41..2d9d261bb31 100644
--- a/sql/sql_select.cc
+++ b/sql/sql_select.cc
@@ -12033,6 +12033,7 @@ static int test_if_order_by_key(ORDER *order, TABLE *table, uint idx,
       */
       if (!on_primary_key &&
           (table->file->table_flags() & HA_PRIMARY_KEY_IN_READ_INDEX) &&
+          table->s->db_type == DB_TYPE_INNODB &&
           table->s->primary_key != MAX_KEY)
       {
         on_primary_key= TRUE;
diff --git a/sql/table.cc b/sql/table.cc
index b231033d4f2..7b826bcdf2d 100644
--- a/sql/table.cc
+++ b/sql/table.cc
@@ -782,7 +782,8 @@ int openfrm(THD *thd, const char *name, const char *alias, uint db_stat,
 	    if (ha_option & HA_PRIMARY_KEY_IN_READ_INDEX)
             {
 	      field->part_of_key= share->keys_in_use;
-              if (field->part_of_sortkey.is_set(key))
+              if (share->db_type == DB_TYPE_INNODB && 
+                  field->part_of_sortkey.is_set(key))
                 field->part_of_sortkey= share->keys_in_use;
             }
 	  }