diff --git a/mysql-test/mysql-test-run.pl b/mysql-test/mysql-test-run.pl
index b3a7427c359..eb4a07b1efa 100755
--- a/mysql-test/mysql-test-run.pl
+++ b/mysql-test/mysql-test-run.pl
@@ -227,7 +227,7 @@ our $opt_mark_progress;
 our $opt_skip;
 our $opt_skip_rpl;
 our $max_slave_num= 0;
-our $max_master_num= 0;
+our $max_master_num= 1;
 our $use_innodb;
 our $opt_skip_test;
 our $opt_skip_im;