diff --git a/settings/js/users/users.js b/settings/js/users/users.js
index 4a4faf13ec7322b176fd3dd6098a71e8d7b663ca..af41790a7c472beb36971bf16587b5c1ce093586 100644
--- a/settings/js/users/users.js
+++ b/settings/js/users/users.js
@@ -592,7 +592,7 @@ var UserList = {
 		if (quota === 'other') {
 			return;
 		}
-		if ((quota !== 'default' && quota !== "none") && (!OC.Util.computerFileSize(quota))) {
+		if (quota !== 'default' && quota !== "none" && OC.Util.computerFileSize(quota) === null) {
 			// the select component has added the bogus value, delete it again
 			$select.find('option[selected]').remove();
 			OC.Notification.showTemporary(t('core', 'Invalid quota value "{val}"', {val: quota}));