diff --git a/templates/openwisp2/settings.py b/templates/openwisp2/settings.py
index 9ac9e03d..a6eaf4c0 100644
--- a/templates/openwisp2/settings.py
+++ b/templates/openwisp2/settings.py
@@ -313,7 +313,6 @@
         'main_log': {
             'level': 'INFO',
             'class': 'logging.handlers.RotatingFileHandler',
-            'formatter': 'verbose',
             'filename': os.path.join(BASE_DIR, 'log/openwisp2.log'),
             'maxBytes': 15728640,
             'backupCount': 3,