diff --git a/s2watchdog/__init__.py b/s2watchdog/__init__.py
index 41395e5..8b97301 100644
--- a/s2watchdog/__init__.py
+++ b/s2watchdog/__init__.py
@@ -122,7 +122,7 @@ def run():
     ttl = data['time_to_live'] - 1
     if ttl <= 0:
         data['emails_sent'] = data['emails_sent'] + 1
-        data['time_to_live'] = GRACE_PERIOD * data['email_sent']
+        data['time_to_live'] = GRACE_PERIOD * data['emails_sent']
         save_data(DATA_STORE_PATH, data)
         send_alert_mail(data)