diff --git a/t/pt-table-sync/replicate.t b/t/pt-table-sync/replicate.t
index d6d0e88a..28f2a592 100644
--- a/t/pt-table-sync/replicate.t
+++ b/t/pt-table-sync/replicate.t
@@ -47,6 +47,8 @@ my $sample = "t/pt-table-sync/samples";
 # https://bugs.launchpad.net/percona-toolkit/+bug/918056
 # #############################################################################
 
+# The slave has 49 extra rows on the low end, e.g. master has rows 50+
+# but slave has rows 1-49 and 50+.  This tests syncing the lower oob chunk.
 $sb->create_dbs($master_dbh, [qw(bug918056)]);
 $sb->load_file('master', "$sample/bug-918056-master.sql", "bug918056");
 $sb->load_file('slave1', "$sample/bug-918056-slave.sql",  "bug918056");
@@ -63,6 +65,22 @@ ok(
    "Sync lower oob (bug 918056)"
 );
 
+# Test syncing the upper oob chunk.
+$sb->load_file('master', "$sample/upper-oob-master.sql", "upper_oob");
+$sb->load_file('slave1', "$sample/upper-oob-slave.sql",  "upper_oob");
+
+ok(
+   no_diff(
+      sub {
+         pt_table_sync::main($master_dsn, qw(--replicate percona.checksums),
+            qw(--print))
+      },
+      "$sample/upper-oob-print.txt",
+      stderr => 1,
+   ),
+   "Sync upper oob (bug 918056)"
+);
+
 # #############################################################################
 # Done.
 # #############################################################################
diff --git a/t/pt-table-sync/samples/upper-oob-master.sql b/t/pt-table-sync/samples/upper-oob-master.sql
new file mode 100644
index 00000000..10feb36e
--- /dev/null
+++ b/t/pt-table-sync/samples/upper-oob-master.sql
@@ -0,0 +1,148 @@
+DROP DATABASE IF EXISTS upper_oob;
+CREATE DATABASE upper_oob;
+USE upper_oob;
+
+CREATE TABLE t (
+  id int not null auto_increment primary key,
+  c  varchar(64)
+) engine=innodb;
+
+insert into t values
+(1, 'Afghanistan'),
+(2, 'Algeria'),
+(3, 'American Samoa'),
+(4, 'Angola'),
+(5, 'Anguilla'),
+(6, 'Argentina'),
+(7, 'Armenia'),
+(8, 'Australia'),
+(9, 'Austria'),
+(10, 'Azerbaijan'),
+(11, 'Bahrain'),
+(12, 'Bangladesh'),
+(13, 'Belarus'),
+(14, 'Bolivia'),
+(15, 'Brazil'),
+(16, 'Brunei'),
+(17, 'Bulgaria'),
+(18, 'Cambodia'),
+(19, 'Cameroon'),
+(20, 'Canada'),
+(21, 'Chad'),
+(22, 'Chile'),
+(23, 'China'),
+(24, 'Colombia'),
+(25, 'Congo, The Democratic Republic of the'),
+(26, 'Czech Republic'),
+(27, 'Dominican Republic'),
+(28, 'Ecuador'),
+(29, 'Egypt'),
+(30, 'Estonia'),
+(31, 'Ethiopia'),
+(32, 'Faroe Islands'),
+(33, 'Finland'),
+(34, 'France'),
+(35, 'French Guiana'),
+(36, 'French Polynesia'),
+(37, 'Gambia'),
+(38, 'Germany'),
+(39, 'Greece'),
+(40, 'Greenland'),
+(41, 'Holy See (Vatican City State)'),
+(42, 'Hong Kong'),
+(43, 'Hungary'),
+(44, 'India'),
+(45, 'Indonesia'),
+(46, 'Iran'),
+(47, 'Iraq'),
+(48, 'Israel'),
+(49, 'Italy'),
+(50, 'Japan'),
+(51, 'Kazakstan'),
+(52, 'Kenya'),
+(53, 'Kuwait'),
+(54, 'Latvia'),
+(55, 'Liechtenstein'),
+(56, 'Lithuania'),
+(57, 'Madagascar'),
+(58, 'Malawi'),
+(59, 'Malaysia'),
+(60, 'Mexico'),
+(61, 'Moldova'),
+(62, 'Morocco'),
+(63, 'Mozambique'),
+(64, 'Myanmar'),
+(65, 'Nauru'),
+(66, 'Nepal'),
+(67, 'Netherlands'),
+(68, 'New Zealand'),
+(69, 'Nigeria'),
+(70, 'North Korea'),
+(71, 'Oman'),
+(72, 'Pakistan'),
+(73, 'Paraguay'),
+(74, 'Peru'),
+(75, 'Philippines'),
+(76, 'Poland'),
+(77, 'Puerto Rico'),
+(78, 'Romania'),
+(79, 'Runion'),
+(80, 'Russian Federation'),
+(81, 'Saint Vincent and the Grenadines'),
+(82, 'Saudi Arabia'),
+(83, 'Senegal'),
+(84, 'Slovakia'),
+(85, 'South Africa'),
+(86, 'South Korea'),
+(87, 'Spain'),
+(88, 'Sri Lanka'),
+(89, 'Sudan'),
+(90, 'Sweden'),
+(91, 'Switzerland'),
+(92, 'Taiwan'),
+(93, 'Tanzania'),
+(94, 'Thailand'),
+(95, 'Tonga'),
+(96, 'Tunisia'),
+(97, 'Turkey'),
+(98, 'Turkmenistan'),
+(99, 'Tuvalu'),
+(100, 'Ukraine'),
+(101, 'United Arab Emirates'),
+(102, 'United Kingdom'),
+(103, 'United States'),
+(104, 'Venezuela'),
+(105, 'Vietnam'),
+(106, 'Virgin Islands, U.S.'),
+(107, 'Yemen'),
+(108, 'Yugoslavia'),
+(109, 'Zambia');
+
+CREATE DATABASE IF NOT EXISTS percona;
+USE percona;
+DROP TABLE IF EXISTS checksums;
+CREATE TABLE `checksums` (
+  `db` char(64) NOT NULL,
+  `tbl` char(64) NOT NULL,
+  `chunk` int(11) NOT NULL,
+  `chunk_time` float DEFAULT NULL,
+  `chunk_index` varchar(200) DEFAULT NULL,
+  `lower_boundary` text,
+  `upper_boundary` text,
+  `this_crc` char(40) NOT NULL,
+  `this_cnt` int(11) NOT NULL,
+  `master_crc` char(40) DEFAULT NULL,
+  `master_cnt` int(11) DEFAULT NULL,
+  `ts` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+  PRIMARY KEY (`db`,`tbl`,`chunk`),
+  KEY `ts_db_tbl` (`ts`,`db`,`tbl`)
+) ENGINE=InnoDB;
+
+SET SQL_LOG_BIN=0;
+DELETE FROM upper_oob.t where id > 99;
+INSERT INTO percona.checksums VALUES
+  ('upper_oob','t',1,0.001144,'PRIMARY','1','50','398f3270',50,'398f3270',50,'2013-01-23 17:36:56'),
+  ('upper_oob','t',2,0.000878,'PRIMARY','51','99','bd9a892d',49,'bd9a892d',49,'2013-01-23 17:36:56'),
+  ('upper_oob','t',3,0.000763,'PRIMARY',NULL,'1','0',0,'0',0,'2013-01-23 17:36:56'),
+  ('upper_oob','t',4,0.000877,'PRIMARY','99',NULL,'0',0,'0',0,'2013-01-23 17:36:56');
+SET SQL_LOG_BIN=1;
diff --git a/t/pt-table-sync/samples/upper-oob-print.txt b/t/pt-table-sync/samples/upper-oob-print.txt
new file mode 100644
index 00000000..e5eca9dd
--- /dev/null
+++ b/t/pt-table-sync/samples/upper-oob-print.txt
@@ -0,0 +1,10 @@
+DELETE FROM `upper_oob`.`t` WHERE `id`='100' LIMIT 1;
+DELETE FROM `upper_oob`.`t` WHERE `id`='101' LIMIT 1;
+DELETE FROM `upper_oob`.`t` WHERE `id`='102' LIMIT 1;
+DELETE FROM `upper_oob`.`t` WHERE `id`='103' LIMIT 1;
+DELETE FROM `upper_oob`.`t` WHERE `id`='104' LIMIT 1;
+DELETE FROM `upper_oob`.`t` WHERE `id`='105' LIMIT 1;
+DELETE FROM `upper_oob`.`t` WHERE `id`='106' LIMIT 1;
+DELETE FROM `upper_oob`.`t` WHERE `id`='107' LIMIT 1;
+DELETE FROM `upper_oob`.`t` WHERE `id`='108' LIMIT 1;
+DELETE FROM `upper_oob`.`t` WHERE `id`='109' LIMIT 1;
diff --git a/t/pt-table-sync/samples/upper-oob-slave.sql b/t/pt-table-sync/samples/upper-oob-slave.sql
new file mode 100644
index 00000000..1cfdafab
--- /dev/null
+++ b/t/pt-table-sync/samples/upper-oob-slave.sql
@@ -0,0 +1,7 @@
+USE percona;
+TRUNCATE TABLE checksums;
+INSERT INTO `checksums` VALUES
+('upper_oob','t',1,0.001144,'PRIMARY','1','50','398f3270',50,'398f3270',50,'2013-01-23 17:36:56'),
+('upper_oob','t',2,0.000878,'PRIMARY','51','99','bd9a892d',49,'bd9a892d',49,'2013-01-23 17:36:56'),
+('upper_oob','t',3,0.000763,'PRIMARY',NULL,'1','0',0,'0',0,'2013-01-23 17:36:56'),
+('upper_oob','t',4,0.000877,'PRIMARY','99',NULL,'0',10,'0',0,'2013-01-23 17:36:56');