diff --git a/mysql-test/mysql-test-run.pl b/mysql-test/mysql-test-run.pl
index 30eab135b24..3c02f8803af 100755
--- a/mysql-test/mysql-test-run.pl
+++ b/mysql-test/mysql-test-run.pl
@@ -1528,8 +1528,8 @@ sub mysql_fix_arguments () {
   mtr_init_args(\$args);
   mtr_add_arg($args, "--defaults-file=%s", $path_config_file);
 
-  mtr_add_arg($args, "--basedir=", $basedir);
-  mtr_add_arg($args, "--bindir=", $path_client_bindir);
+  mtr_add_arg($args, "--basedir=%s", $basedir);
+  mtr_add_arg($args, "--bindir=%s", $path_client_bindir);
   mtr_add_arg($args, "--verbose");
   return mtr_args2str($exe, @$args);
 }