--- a/src/test/regress/expected/gist.out
+++ b/src/test/regress/expected/gist.out
@@ -9,11 +9,12 @@ create index gist_pointidx on gist_point_tbl using gist(p);
 create index gist_pointidx2 on gist_point_tbl using gist(p) with (buffering = on, fillfactor=50);
 create index gist_pointidx3 on gist_point_tbl using gist(p) with (buffering = off);
 create index gist_pointidx4 on gist_point_tbl using gist(p) with (buffering = auto);
-drop index gist_pointidx2, gist_pointidx3, gist_pointidx4;
+create index gist_pointidx4b on gist_point_tbl using gist(p) with (buffering = true);
+drop index gist_pointidx2, gist_pointidx3, gist_pointidx4, gist_pointidx4b;
 -- Make sure bad values are refused
 create index gist_pointidx5 on gist_point_tbl using gist(p) with (buffering = invalid_value);
 ERROR:  invalid value for option "buffering": invalid_value
-DETAIL:  Valid values are "on", "off", and "auto".
+DETAIL:  Valid values are "on", "off", "true", "false", "yes", "no", "1", "0", and "auto".
 create index gist_pointidx5 on gist_point_tbl using gist(p) with (fillfactor=9);
 ERROR:  value 9 out of bounds for option "fillfactor"
 DETAIL:  Valid values are between "10" and "100".

--- a/src/test/regress/sql/gist.sql
+++ b/src/test/regress/sql/gist.sql
@@ -11,7 +11,8 @@ create index gist_pointidx on gist_point_tbl using gist(p);
 create index gist_pointidx2 on gist_point_tbl using gist(p) with (buffering = on, fillfactor=50);
 create index gist_pointidx3 on gist_point_tbl using gist(p) with (buffering = off);
 create index gist_pointidx4 on gist_point_tbl using gist(p) with (buffering = auto);
-drop index gist_pointidx2, gist_pointidx3, gist_pointidx4;
+create index gist_pointidx4b on gist_point_tbl using gist(p) with (buffering = true);
+drop index gist_pointidx2, gist_pointidx3, gist_pointidx4, gist_pointidx4b;