diff --git a/phpBB/includes/functions.php b/phpBB/includes/functions.php
index 4f52c7c2ce..026496bfb3 100644
--- a/phpBB/includes/functions.php
+++ b/phpBB/includes/functions.php
@@ -175,11 +175,8 @@ function set_config_count($config_name, $increment, $is_dynamic = false)
 	switch ($db->sql_layer)
 	{
 		case 'firebird':
-			$sql_update = 'CAST(CAST(config_value as integer) + ' . (int) $increment . ' as VARCHAR(255))';
-		break;
-
 		case 'postgres':
-			$sql_update = 'int4(config_value) + ' . (int) $increment;
+			$sql_update = 'CAST(CAST(config_value as DECIMAL(255, 0)) + ' . (int) $increment . ' as VARCHAR(255))';
 		break;
 
 		// MySQL, SQlite, mssql, mssql_odbc, oracle