diff --git a/lib/private/legacy/helper.php b/lib/private/legacy/helper.php
index 25cfff3036b0d18d1ad5d694da77e2bd1bcd49c1..f107d47faf7cfc2b28e5b53fa23171beed69f363 100644
--- a/lib/private/legacy/helper.php
+++ b/lib/private/legacy/helper.php
@@ -469,7 +469,7 @@ class OC_Helper {
 	 */
 	public static function freeSpace($dir) {
 		$freeSpace = \OC\Files\Filesystem::free_space($dir);
-		if ($freeSpace !== \OCP\Files\FileInfo::SPACE_UNKNOWN) {
+		if ($freeSpace < \OCP\Files\FileInfo::SPACE_UNLIMITED) {
 			$freeSpace = max($freeSpace, 0);
 			return $freeSpace;
 		} else {