diff --git a/wcsinst/wcsinstd/deploy.py b/wcsinst/wcsinstd/deploy.py
index 06c9f2e..43b376d 100644
--- a/wcsinst/wcsinstd/deploy.py
+++ b/wcsinst/wcsinstd/deploy.py
@@ -94,8 +94,12 @@ class DeployInstance(object):
         else:
             database_name = '%s_%s' % (database_name, domain_table_name)
 
+        postgresql_cfg = {}
+        for k, v in wcs_cfg['postgresql'].items():
+            if v:
+                postgresql_cfg[k] = v
         try:
-            pgconn = psycopg2.connect(**wcs_cfg['postgresql'])
+            pgconn = psycopg2.connect(**postgresql_cfg)
         except psycopg2.Error:
             # XXX: log
             raise