diff --git a/wcs_olap/feeder.py b/wcs_olap/feeder.py
index eb87827..aec0266 100644
--- a/wcs_olap/feeder.py
+++ b/wcs_olap/feeder.py
@@ -361,7 +361,7 @@ CREATE TABLE public.dates AS (SELECT
             )
             # Update sequence
             self.ex("""SELECT setval(pg_get_serial_sequence('{name}', 'id'),
-            (SELECT MAX(id) FROM {name}))""", ctx={'name': name})
+            (SELECT GREATEST(1, MAX(id)) FROM {name}))""", ctx={'name': name})
 
     def create_labeled_table(self, name, labels, comment=None):
         self.create_table(