diff --git a/src/cloudron.js b/src/cloudron.js
index f4b0b9156..730c9eb7b 100644
--- a/src/cloudron.js
+++ b/src/cloudron.js
@@ -766,7 +766,7 @@ function checkDiskSpace(callback) {
 
         var oos = entries.some(function (entry) {
             return (entry.mount === paths.DATA_DIR && entry.capacity >= 0.90) ||
-                   (entry.mount === '/' && entry.capacity >= 0.95);
+                   (entry.mount === '/' && entry.used <= (1.25 * 1024 * 1024)); // 1.5G
         });
 
         debug('Disk space checked. ok: %s', !oos);