--- src/org/hsqldb/persist/HsqlDatabaseProperties.java	2008-03-17 17:05:41.000000000 +0100
+++ src/org/hsqldb/persist/HsqlDatabaseProperties.java-gil	2011-01-29 09:15:02.000000000 +0100
@@ -429,6 +429,7 @@
             setProperty(hsqldb_log_size, 10);
             setProperty(sql_enforce_strict_size, true);
             setProperty(hsqldb_nio_data_file, false);
+            setProperty(hsqldb_lock_file, true);
         }
 
         // OOo end