diff --git a/backend.py b/backend.py
index 233071f..4e1f306 100644
--- a/backend.py
+++ b/backend.py
@@ -129,7 +129,7 @@ class EventResource(BaseEvent):
         m = re.match('(LAST|NEXT)(YEAR|MONTH|WEEK|DAY|HOUR|MINUTE)',when)
         if m is not None:
             when = m.group(1)+'1'+m.group(2)+'S'
-        m = re.match('(LAST|NEXT)([0-9]*)(YEAR|MONTHMONTH|WEEK|MINUTE|HOUR|DAY)S',when)
+        m = re.match('(LAST|NEXT)([0-9]*)(YEAR|MONTH|WEEK|MINUTE|HOUR|DAY)S',when)
         if m is not None:
             if m.group(1) == 'LAST':
                 event_start = "now() - INTERVAL '%s %s'" % m.group(2,3)