diff --git a/plugins/calendar/drivers/database/SQL/postgres.initial.sql b/plugins/calendar/drivers/database/SQL/postgres.initial.sql
index 27223cbb..d1a8b03d 100644
--- a/plugins/calendar/drivers/database/SQL/postgres.initial.sql
+++ b/plugins/calendar/drivers/database/SQL/postgres.initial.sql
@@ -50,16 +50,16 @@ CREATE TABLE events (
     "start" timestamp without time zone DEFAULT now() NOT NULL,
     "end" timestamp without time zone DEFAULT now() NOT NULL,
     recurrence varchar(255) DEFAULT NULL,
-    title character varying(255) NOT NULL,
-    description text NOT NULL,
-    location character varying(255) NOT NULL,
-    categories character varying(255) NOT NULL,
-    url character varying(255) NOT NULL,
+    title character varying(255) NOT NULL DEFAULT '',
+    description text NOT NULL DEFAULT '',
+    location character varying(255) NOT NULL DEFAULT '',
+    categories character varying(255) NOT NULL DEFAULT '',
+    url character varying(255) NOT NULL DEFAULT '',
     all_day smallint NOT NULL DEFAULT 0,
     free_busy smallint NOT NULL DEFAULT 0,
     priority smallint NOT NULL DEFAULT 0,
     sensitivity smallint NOT NULL DEFAULT 0,
-    status character varying(32) NOT NULL,
+    status character varying(32) NOT NULL DEFAULT '',
     alarms varchar(255) DEFAULT NULL,
     attendees text DEFAULT NULL,
     notifyat timestamp without time zone DEFAULT NULL,