diff --git a/phpBB/install/database_update.php b/phpBB/install/database_update.php
index 3716c03030..a6e5921b63 100644
--- a/phpBB/install/database_update.php
+++ b/phpBB/install/database_update.php
@@ -2209,11 +2209,19 @@ function change_database_data(&$no_updates, $version)
 
 			if (!isset($config['fulltext_postgres_ts_name']))
 			{
-				set_config('fulltext_postgres_max_word_len', 254);
-				set_config('fulltext_postgres_min_word_len', 4);
 				set_config('fulltext_postgres_ts_name', 'simple');
 			}
 
+			if (!isset($config['fulltext_postgres_min_word_len']))
+			{
+				set_config('fulltext_postgres_min_word_len', 4);
+			}
+
+			if (!isset($config['fulltext_postgres_max_word_len']))
+			{
+				set_config('fulltext_postgres_max_word_len', 254);
+			}
+
 			if (!isset($config['load_jquery_cdn']))
 			{
 				set_config('load_jquery_cdn', 0);