diff --git a/src/backend/postmaster/pgstat.c b/src/backend/postmaster/pgstat.c
index a9efee8..c7dee95 100644
--- a/src/backend/postmaster/pgstat.c
+++ b/src/backend/postmaster/pgstat.c
@@ -2227,6 +2227,13 @@ pgstat_twophase_postcommit(TransactionId xid, uint16 info,
 	pgstat_info->t_counts.t_tuples_deleted += rec->tuples_deleted;
 	pgstat_info->t_counts.t_truncated = rec->t_truncated;
 
+	/* forget live/dead stats seen by backend thus far */
+	if (rec->t_truncated)
+	{
+		pgstat_info->t_counts.t_delta_live_tuples = 0;
+		pgstat_info->t_counts.t_delta_dead_tuples = 0;
+	}
+
 	pgstat_info->t_counts.t_delta_live_tuples +=
 		rec->tuples_inserted - rec->tuples_deleted;
 	pgstat_info->t_counts.t_delta_dead_tuples +=
diff --git a/src/test/regress/expected/stats.out b/src/test/regress/expected/stats.out
index a811265..e4dc333 100644
--- a/src/test/regress/expected/stats.out
+++ b/src/test/regress/expected/stats.out
@@ -84,6 +84,7 @@ CREATE TABLE trunc_stats_test1(id serial);
 CREATE TABLE trunc_stats_test2(id serial);
 CREATE TABLE trunc_stats_test3(id serial);
 CREATE TABLE trunc_stats_test4(id serial);
+CREATE TABLE trunc_stats_test5(id serial);
 -- check that n_live_tup is reset to 0 after truncate
 INSERT INTO trunc_stats_test DEFAULT VALUES;
 INSERT INTO trunc_stats_test DEFAULT VALUES;
@@ -129,6 +130,14 @@ INSERT INTO trunc_stats_test4 DEFAULT VALUES;
 TRUNCATE trunc_stats_test4;
 INSERT INTO trunc_stats_test4 DEFAULT VALUES;
 ROLLBACK;
+-- truncate and two-phase commit
+INSERT INTO trunc_stats_test5 DEFAULT VALUES;
+INSERT INTO trunc_stats_test5 DEFAULT VALUES;
+INSERT INTO trunc_stats_test5 DEFAULT VALUES;
+BEGIN;
+TRUNCATE trunc_stats_test5;
+PREPARE TRANSACTION 'twophase_stats';
+COMMIT PREPARED 'twophase_stats';
 -- do a seqscan
 SELECT count(*) FROM tenk2;
  count 
@@ -169,7 +178,8 @@ SELECT relname, n_tup_ins, n_tup_upd, n_tup_del, n_live_tup, n_dead_tup
  trunc_stats_test2 |         1 |         0 |         0 |          1 |          0
  trunc_stats_test3 |         4 |         0 |         0 |          2 |          2
  trunc_stats_test4 |         2 |         0 |         0 |          0 |          2
-(5 rows)
+ trunc_stats_test5 |         3 |         0 |         0 |          0 |          0
+(6 rows)
 
 SELECT st.seq_scan >= pr.seq_scan + 1,
        st.seq_tup_read >= pr.seq_tup_read + cl.reltuples,
@@ -198,5 +208,5 @@ FROM prevstats AS pr;
  t
 (1 row)
 
-DROP TABLE trunc_stats_test, trunc_stats_test1, trunc_stats_test2, trunc_stats_test3, trunc_stats_test4;
+DROP TABLE trunc_stats_test, trunc_stats_test1, trunc_stats_test2, trunc_stats_test3, trunc_stats_test4, trunc_stats_test5;
 -- End of Stats Test
diff --git a/src/test/regress/sql/stats.sql b/src/test/regress/sql/stats.sql
index b3e2efa..46f044b 100644
--- a/src/test/regress/sql/stats.sql
+++ b/src/test/regress/sql/stats.sql
@@ -80,6 +80,7 @@ CREATE TABLE trunc_stats_test1(id serial);
 CREATE TABLE trunc_stats_test2(id serial);
 CREATE TABLE trunc_stats_test3(id serial);
 CREATE TABLE trunc_stats_test4(id serial);
+CREATE TABLE trunc_stats_test5(id serial);
 
 -- check that n_live_tup is reset to 0 after truncate
 INSERT INTO trunc_stats_test DEFAULT VALUES;
@@ -132,6 +133,15 @@ TRUNCATE trunc_stats_test4;
 INSERT INTO trunc_stats_test4 DEFAULT VALUES;
 ROLLBACK;
 
+-- truncate and two-phase commit
+INSERT INTO trunc_stats_test5 DEFAULT VALUES;
+INSERT INTO trunc_stats_test5 DEFAULT VALUES;
+INSERT INTO trunc_stats_test5 DEFAULT VALUES;
+BEGIN;
+TRUNCATE trunc_stats_test5;
+PREPARE TRANSACTION 'twophase_stats';
+COMMIT PREPARED 'twophase_stats';
+
 -- do a seqscan
 SELECT count(*) FROM tenk2;
 -- do an indexscan
@@ -164,5 +174,5 @@ SELECT st.heap_blks_read + st.heap_blks_hit >= pr.heap_blks + cl.relpages,
 SELECT pr.snap_ts < pg_stat_get_snapshot_timestamp() as snapshot_newer
 FROM prevstats AS pr;
 
-DROP TABLE trunc_stats_test, trunc_stats_test1, trunc_stats_test2, trunc_stats_test3, trunc_stats_test4;
+DROP TABLE trunc_stats_test, trunc_stats_test1, trunc_stats_test2, trunc_stats_test3, trunc_stats_test4, trunc_stats_test5;
 -- End of Stats Test