diff --git a/netbox/extras/constants.py b/netbox/extras/constants.py
index 9707d9121..3836d520e 100644
--- a/netbox/extras/constants.py
+++ b/netbox/extras/constants.py
@@ -1,6 +1,10 @@
 from __future__ import unicode_literals
 
 
+# https://www.postgresql.org/docs/current/libpq-status.html#LIBPQ-PQSERVERVERSION
+DB_MINIMUM_VERSION = 90400  # 9.4.0
+
+
 # Models which support custom fields
 CUSTOMFIELD_MODELS = (
     'provider', 'circuit',                                         # Circuits