diff --git a/mysql-test/t/plugin_auth.test b/mysql-test/t/plugin_auth.test
index 351f61c57d1..49fbfa6995b 100644
--- a/mysql-test/t/plugin_auth.test
+++ b/mysql-test/t/plugin_auth.test
@@ -400,7 +400,7 @@ FLUSH PRIVILEGES;
 --echo #
 
 --echo # Executing 'mysql'
---exec $MYSQL -u root -S $MASTER_MYSOCK -P $MASTER_MYPORT --default-auth=auth_test_plugin $PLUGIN_AUTH_OPT -e 'SELECT 1'
+--exec $MYSQL -u root -S $MASTER_MYSOCK -P $MASTER_MYPORT --default-auth=auth_test_plugin $PLUGIN_AUTH_OPT -e "SELECT 1"
 
 --echo # Executing 'mysqladmin'
 --exec $MYSQLADMIN -u root -S $MASTER_MYSOCK -P $MASTER_MYPORT --default-auth=auth_test_plugin $PLUGIN_AUTH_OPT ping