diff --git a/examples/sql/pgsql.calendars.sql b/examples/sql/pgsql.calendars.sql
index caaaa888d2..c51515c9ea 100644
--- a/examples/sql/pgsql.calendars.sql
+++ b/examples/sql/pgsql.calendars.sql
@@ -56,8 +56,8 @@ CREATE UNIQUE INDEX calendarinstances_principaluri_uri
 CREATE UNIQUE INDEX calendarinstances_principaluri_calendarid
     ON calendarinstances USING btree (principaluri, calendarid);
 
-CREATE UNIQUE INDEX calendarinstances_principaluri_share_href
-    ON calendarinstances USING btree (principaluri, share_href);
+CREATE UNIQUE INDEX calendarinstances_calendarid_share_href
+    ON calendarinstances USING btree (calendarid, share_href);
 
 CREATE TABLE calendarsubscriptions (
     id SERIAL NOT NULL,