diff --git a/src/backend/access/gist/gistbuild.c b/src/backend/access/gist/gistbuild.c
index 671b5e9186..cee81d58ad 100644
--- a/src/backend/access/gist/gistbuild.c
+++ b/src/backend/access/gist/gistbuild.c
@@ -456,6 +456,10 @@ gistBuildCallback(Relation index,
 	itup = gistFormTuple(buildstate->giststate, index, values, isnull, true);
 	itup->t_tid = *tid;

+	/* Update tuple count and total size. */
+	buildstate->indtuples += 1;
+	buildstate->indtuplesSize += IndexTupleSize(itup);
+
 	if (buildstate->bufferingMode == GIST_BUFFERING_ACTIVE)
 	{
 		/* We have buffers, so use them. */
@@ -471,10 +475,6 @@ gistBuildCallback(Relation index,
 					 buildstate->giststate, buildstate->heaprel, true);
 	}

-	/* Update tuple count and total size. */
-	buildstate->indtuples += 1;
-	buildstate->indtuplesSize += IndexTupleSize(itup);
-
 	MemoryContextSwitchTo(oldCtx);
 	MemoryContextReset(buildstate->giststate->tempCxt);

diff --git a/src/test/regress/expected/gist.out b/src/test/regress/expected/gist.out
index 90edb4061d..8515a63c07 100644
--- a/src/test/regress/expected/gist.out
+++ b/src/test/regress/expected/gist.out
@@ -22,9 +22,12 @@ ERROR:  value 101 out of bounds for option "fillfactor"
 DETAIL:  Valid values are between "10" and "100".
 -- Insert enough data to create a tree that's a couple of levels deep.
 insert into gist_point_tbl (id, p)
-select g,        point(g*10, g*10) from generate_series(1, 10000) g;
+select g,        point(g*10, g*10) from generate_series(1, 20000) g;
 insert into gist_point_tbl (id, p)
 select g+100000, point(g*10+1, g*10+1) from generate_series(1, 10000) g;
+-- Test buffering index build with data
+create index gist_pointidx6 on gist_point_tbl using gist(p) with (buffering = on, fillfactor=50);
+drop index gist_pointidx6;
 -- To test vacuum, delete some entries from all over the index.
 delete from gist_point_tbl where id % 2 = 1;
 -- And also delete some concentration of values.
diff --git a/src/test/regress/sql/gist.sql b/src/test/regress/sql/gist.sql
index b9d398ea94..0efb265ec3 100644
--- a/src/test/regress/sql/gist.sql
+++ b/src/test/regress/sql/gist.sql
@@ -20,11 +20,15 @@ create index gist_pointidx5 on gist_point_tbl using gist(p) with (fillfactor=101

 -- Insert enough data to create a tree that's a couple of levels deep.
 insert into gist_point_tbl (id, p)
-select g,        point(g*10, g*10) from generate_series(1, 10000) g;
+select g,        point(g*10, g*10) from generate_series(1, 20000) g;

 insert into gist_point_tbl (id, p)
 select g+100000, point(g*10+1, g*10+1) from generate_series(1, 10000) g;

+-- Test buffering index build with data
+create index gist_pointidx6 on gist_point_tbl using gist(p) with (buffering = on, fillfactor=50);
+drop index gist_pointidx6;
+
 -- To test vacuum, delete some entries from all over the index.
 delete from gist_point_tbl where id % 2 = 1;