diff --git a/t/lib/CompareResults.t b/t/lib/CompareResults.t
index 5da8d7a4..db03f433 100644
--- a/t/lib/CompareResults.t
+++ b/t/lib/CompareResults.t
@@ -642,6 +642,7 @@ $dbh1->do('update test.t3 set f=0 where 1');
 $dbh1->do('SET SQL_LOG_BIN=0');
 $dbh1->do('insert into test.t3 values (2.0),(3.0)');
 $dbh1->do('SET SQL_LOG_BIN=1');
+$sb->wait_for_slaves();
 
 my $left_n_rows = $dbh1->selectcol_arrayref('select count(*) from test.t3')->[0];
 my $right_n_rows = $dbh2->selectcol_arrayref('select count(*) from test.t3')->[0];