diff --git a/mysql-test/mysql-test-run.pl b/mysql-test/mysql-test-run.pl
index 48eb9eda51e..bf5915cfc1c 100755
--- a/mysql-test/mysql-test-run.pl
+++ b/mysql-test/mysql-test-run.pl
@@ -235,7 +235,7 @@ 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;