diff --git a/ZPsycopgDA/db.py b/ZPsycopgDA/db.py
index b594b3fd..37e6f9d5 100644
--- a/ZPsycopgDA/db.py
+++ b/ZPsycopgDA/db.py
@@ -26,7 +26,7 @@ import pool
 import psycopg2
 from psycopg2.extensions import INTEGER, LONGINTEGER, FLOAT, BOOLEAN, DATE, TIME
 from psycopg2.extensions import TransactionRollbackError, register_type
-from psycopg2 import NUMBER, STRING, ROWID, DATETIME 
+from psycopg2 import NUMBER, STRING, ROWID, DATETIME
 
 
 # the DB object, managing all the real query work
@@ -107,17 +107,17 @@ class DB(TM, dbi_db.DB):
     def make_mappings(self):
         """Generate the mappings used later by self.convert_description()."""
         self.type_mappings = {}
-	for t, s in [(INTEGER,'i'), (LONGINTEGER, 'i'), (NUMBER, 'n'),  
-	             (BOOLEAN,'n'), (ROWID, 'i'),
-	             (DATETIME, 'd'), (DATE, 'd'), (TIME, 'd')]:
+        for t, s in [(INTEGER,'i'), (LONGINTEGER, 'i'), (NUMBER, 'n'),
+                     (BOOLEAN,'n'), (ROWID, 'i'),
+                     (DATETIME, 'd'), (DATE, 'd'), (TIME, 'd')]:
             for v in t.values:
-	        self.type_mappings[v] = (t, s)
+                self.type_mappings[v] = (t, s)
 
     def convert_description(self, desc, use_psycopg_types=False):
         """Convert DBAPI-2.0 description field to Zope format."""
         items = []
         for name, typ, width, ds, p, scale, null_ok in desc:
-	    m = self.type_mappings.get(typ, (STRING, 's'))
+            m = self.type_mappings.get(typ, (STRING, 's'))
             items.append({
                 'name': name,
                 'type': use_psycopg_types and m[0] or m[1],
@@ -158,7 +158,7 @@ class DB(TM, dbi_db.DB):
             return ()
         self.putconn()
         return self.convert_description(c.description, True)
-    
+
     ## query execution ##
 
     def query(self, query_string, max_rows=None, query_data=None):
@@ -205,5 +205,5 @@ class DB(TM, dbi_db.DB):
         except StandardError, err:
             self._abort()
             raise err
-        
+
         return self.convert_description(desc), res
diff --git a/ZPsycopgDA/test_da.py b/ZPsycopgDA/test_da.py
new file mode 100644
index 00000000..83197671
--- /dev/null
+++ b/ZPsycopgDA/test_da.py
@@ -0,0 +1,42 @@
+# zopectl run script to test the DA/threading behavior
+#
+# Usage: bin/zopectl run test_da.py "dbname=xxx"
+#
+from Products.ZPsycopgDA.DA import ZDATETIME
+from Products.ZPsycopgDA.db import DB
+import sys
+import threading
+
+
+dsn = sys.argv[1]
+
+
+typecasts = [ZDATETIME]
+
+
+def DA_connect():
+    db = DB(dsn, tilevel=2, typecasts=typecasts)
+    db.open()
+    return db
+
+
+def assert_casts(conn, name):
+    connection = conn.getcursor().connection
+    if (connection.string_types ==
+            {1114: ZDATETIME, 1184: ZDATETIME}):
+        print '%s pass\n' % name
+    else:
+        print '%s fail (%s)\n' % (name, connection.string_types)
+
+
+def test_connect(name):
+    assert_casts(conn1, name)
+
+
+conn1 = DA_connect()
+t1 = threading.Thread(target=test_connect, args=('t1',))
+t1.start()
+t2 = threading.Thread(target=test_connect, args=('t2',))
+t2.start()
+t1.join()
+t2.join()