diff --git a/rowers/alerts.py b/rowers/alerts.py
index 0d43abb9..9226f517 100644
--- a/rowers/alerts.py
+++ b/rowers/alerts.py
@@ -155,7 +155,7 @@ def alert_get_stats(alert,nperiod=0):
         mask = df[alert.measured.metric] > alert.measured.value1
         df2 = df[mask].copy()
     elif alert.measured.condition == '<':
-        mask = df[alert.measured.metric] > alert.measured.value1
+        mask = df[alert.measured.metric] < alert.measured.value1
         df2 = df[mask].copy()
     elif alert.measured.condition == 'between':
         mask = df[alert.measured.metric] > alert.measured.value1