diff --git a/phpBB/install/schemas/schema_data.sql b/phpBB/install/schemas/schema_data.sql
index 82cf4d8418..7afed448ad 100644
--- a/phpBB/install/schemas/schema_data.sql
+++ b/phpBB/install/schemas/schema_data.sql
@@ -97,6 +97,7 @@ INSERT INTO phpbb_config (config_name, config_value) VALUES ('display_last_edite
 INSERT INTO phpbb_config (config_name, config_value) VALUES ('display_last_subject', '1');
 INSERT INTO phpbb_config (config_name, config_value) VALUES ('display_order', '0');
 INSERT INTO phpbb_config (config_name, config_value) VALUES ('edit_time', '0');
+INSERT INTO phpbb_config (config_name, config_value) VALUES ('extension_force_unstable', '0');
 INSERT INTO phpbb_config (config_name, config_value) VALUES ('delete_time', '0');
 INSERT INTO phpbb_config (config_name, config_value) VALUES ('email_check_mx', '1');
 INSERT INTO phpbb_config (config_name, config_value) VALUES ('email_enable', '1');