diff --git a/examples/sql/pgsql.calendars.sql b/examples/sql/pgsql.calendars.sql
index 67dc41a5a7..caaaa888d2 100644
--- a/examples/sql/pgsql.calendars.sql
+++ b/examples/sql/pgsql.calendars.sql
@@ -103,3 +103,6 @@ CREATE TABLE schedulingobjects (
     etag VARCHAR(32),
     size INTEGER NOT NULL
 );
+
+ALTER TABLE ONLY schedulingobjects
+    ADD CONSTRAINT schedulingobjects_pkey PRIMARY KEY (id);