diff --git a/xCAT-test/autotest/testcase/installation/reg_linux_diskfull_installation_hierarchy b/xCAT-test/autotest/testcase/installation/reg_linux_diskfull_installation_hierarchy
index 2510820e1..f82d40082 100644
--- a/xCAT-test/autotest/testcase/installation/reg_linux_diskfull_installation_hierarchy
+++ b/xCAT-test/autotest/testcase/installation/reg_linux_diskfull_installation_hierarchy
@@ -58,7 +58,7 @@ check:output=~Provision node\(s\)\: $$CN
 cmd:xdsh $$SN "if [[ -f /var/lib/dhcp/db/dhcpd.leases ]]; then cat /var/lib/dhcp/db/dhcpd.leases; elif [[ -f /var/lib/dhcpd/dhcpd.leases ]];then cat /var/lib/dhcpd/dhcpd.leases;elif [[ -f /var/lib/dhcp/dhcpd.leases ]];then cat /var/lib/dhcp/dhcpd.leases; fi"
 cmd:if [[ "__GETNODEATTR($$CN,arch)__" =~ "ppc" ]]; then sleep 120;elif [[ "__GETNODEATTR($$CN,arch)__" =~ "x86_64" ]];then sleep 200;else sleep 180;fi
 
-ping $$CN -c 3
+cmd:ping $$CN -c 3
 check:rc==0
 check:output=~64 bytes from $$CN
 cmd:lsdef -l $$CN | grep status