diff --git a/main.py b/main.py
index b795f1a..a39505d 100755
--- a/main.py
+++ b/main.py
@@ -96,7 +96,7 @@ try:
                 zipHandler.extractall(glob.conf['default']['outdir'])
                 zipHandler.close()
                 luh = open(glob.conf['default']['outdir'] + '/lastupdate.txt', 'w')
-                luh.write(mtime)
+                luh.write(str(mtime))
                 luh.close()
             else:
                 logging.error("Update failed")