diff --git a/apps/files_external/lib/config.php b/apps/files_external/lib/config.php
index ffbab7bca8..c5b091336e 100755
--- a/apps/files_external/lib/config.php
+++ b/apps/files_external/lib/config.php
@@ -538,7 +538,12 @@ class OC_Mount_Config {
 			$datadir = \OC_Config::getValue('datadirectory', \OC::$SERVERROOT . '/data/');
 			$file = \OC_Config::getValue('mount_file', $datadir . '/mount.json');
 		}
-		$content = json_encode($data);
+		$options = 0;
+		if (defined('JSON_PRETTY_PRINT')) {
+			// only for PHP >= 5.4
+			$options = JSON_PRETTY_PRINT;
+		}
+		$content = json_encode($data, $options);
 		@file_put_contents($file, $content);
 		@chmod($file, 0640);
 	}