diff --git a/lib/dml/simpletest/testdml.php b/lib/dml/simpletest/testdml.php
index cf931ed96a395..333e942f538d5 100755
--- a/lib/dml/simpletest/testdml.php
+++ b/lib/dml/simpletest/testdml.php
@@ -2347,6 +2347,7 @@ public function test_get_records_sql_complicated() {
 
         $table->add_field('id', XMLDB_TYPE_INTEGER, '10', XMLDB_UNSIGNED, XMLDB_NOTNULL, XMLDB_SEQUENCE, null);
         $table->add_field('course', XMLDB_TYPE_INTEGER, '10', XMLDB_UNSIGNED, XMLDB_NOTNULL, null, '0');
+        $table->add_key('primary', XMLDB_KEY_PRIMARY, array('id'));
         $dbman->create_table($table);
         $this->tables[$tablename] = $table;