diff --git a/VERSION b/VERSION
index 4b150ea3..9598cb17 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-Version 2.4.6-stable+timestamp.2013.05.12.20.06.49
+Version 2.4.6-stable+timestamp.2013.05.13.10.11.03
diff --git a/gluon/dal.py b/gluon/dal.py
index 6354769b..82bada16 100644
--- a/gluon/dal.py
+++ b/gluon/dal.py
@@ -8216,7 +8216,7 @@ class Table(object):
         self._plural = args.get(
             'plural',pluralize(self._singular.lower()).capitalize())
         # horrible but for backard compatibility of appamdin:
-        if 'primarykey' in args and args['primarykey']:
+        if 'primarykey' in args and args['primarykey'] is not None:
             self._primarykey = args.get('primarykey')
 
         self._before_insert = []