diff --git wp-admin/setup-config.php wp-admin/setup-config.php
index 1ad40fc..9550e9d 100644
--- wp-admin/setup-config.php
+++ wp-admin/setup-config.php
@@ -215,6 +215,19 @@ switch($step) {
 			<td><input name="prefix" id="prefix" type="text" value="wp_" size="25" /></td>
 			<td><?php _e( 'If you want to run multiple WordPress installations in a single database, change this.' ); ?></td>
 		</tr>
+		<?php
+			$tmp_file = tempnam(sys_get_temp_dir(), 'wp');
+			$tmp_file_owner = fileowner($tmp_file);
+			unlink($tmp_file);
+		?>
+		<?php if (is_writable(ABSPATH) && $tmp_file_owner != fileowner(__FILE__)): ?>
+		<tr>
+			<td scope="row" colspan="3">
+				<input name="wp_config_write" id="wp_config_write" type="checkbox" value="1" />
+				<?php _e( 'Allow other system users to write into wp-config.php' ); ?>
+			</td>
+		</tr>
+		<?php endif; ?>
 	</table>
 	<?php if ( isset( $_GET['noapi'] ) ) { ?><input name="noapi" type="hidden" value="1" /><?php } ?>
 	<input type="hidden" name="language" value="<?php echo esc_attr( $language ); ?>" />
@@ -232,6 +245,7 @@ switch($step) {
 	$pwd = trim( wp_unslash( $_POST[ 'pwd' ] ) );
 	$dbhost = trim( wp_unslash( $_POST[ 'dbhost' ] ) );
 	$prefix = trim( wp_unslash( $_POST[ 'prefix' ] ) );
+	$wp_config_write = isset($_POST[ 'wp_config_write']) && '1' === $_POST[ 'wp_config_write'];
 
 	$step_1 = 'setup-config.php?step=1';
 	$install = 'install.php';
@@ -398,7 +412,7 @@ if ( ! /iPad|iPod|iPhone/.test( navigator.userAgent ) ) {
 			fwrite( $handle, $line );
 		}
 		fclose( $handle );
-		chmod( $path_to_wp_config, 0666 );
+		chmod( $path_to_wp_config, $wp_config_write ? 0666 : 0600 );
 		setup_config_display_header();
 ?>
 <h1 class="screen-reader-text"><?php _e( 'Successful database connection' ) ?></h1>