diff --git a/xCAT-test/autotest/testcase/installation/reg_linux_diskfull_installation_flat b/xCAT-test/autotest/testcase/installation/reg_linux_diskfull_installation_flat
index ba055d3dd..9d1311e7b 100644
--- a/xCAT-test/autotest/testcase/installation/reg_linux_diskfull_installation_flat
+++ b/xCAT-test/autotest/testcase/installation/reg_linux_diskfull_installation_flat
@@ -7,7 +7,7 @@ cmd:df -T
 cmd:if ping -c 1 $$SN > /dev/null;then rpower $$SN off > /dev/null;fi
 cmd:MINIISO=NUll;if [[ "__GETNODEATTR($$CN,os)__" =~ "ubuntu" ]] && [[ "__GETNODEATTR($$CN,arch)__" =~ "ppc64" ]];then mkdir /tmp/iso; mount -o loop $$MINIISO /tmp/iso ;  mkdir -p  /install/__GETNODEATTR($$CN,os)__/__GETNODEATTR($$CN,arch)__/install/netboot; cp  /tmp/iso/install/initrd.gz  /install/__GETNODEATTR($$CN,os)__/__GETNODEATTR($$CN,arch)__/install/netboot;umount /tmp/iso; rmdir /tmp/iso; fi
 check:rc==0
-cmd:chdef $$SN -m groups=service
+cmd: if lsdef service > /dev/null 2>&1; then chdef service -m groups=service;fi
 check:rc==0
 cmd:chdef -t node -o $$CN servicenode= monserver=$$MN nfsserver=$$MN tftpserver=$$MN  xcatmaster=$$MN
 check:rc==0
diff --git a/xCAT-test/autotest/testcase/installation/reg_linux_diskless_installation_flat b/xCAT-test/autotest/testcase/installation/reg_linux_diskless_installation_flat
index fe06ccc5f..b07ed2f83 100644
--- a/xCAT-test/autotest/testcase/installation/reg_linux_diskless_installation_flat
+++ b/xCAT-test/autotest/testcase/installation/reg_linux_diskless_installation_flat
@@ -4,7 +4,7 @@ label:flat_cn_diskless,provision
 #stop:yes
 cmd:fdisk -l
 cmd:df -T
-cmd:chdef $$SN -m groups=service
+cmd: if lsdef service > /dev/null 2>&1; then chdef service -m groups=service;fi
 check:rc==0
 cmd:chdef -t node -o $$CN servicenode= monserver=$$MN nfsserver=$$MN tftpserver=$$MN  xcatmaster=$$MN
 check:rc==0
diff --git a/xCAT-test/autotest/testcase/installation/reg_linux_statelite_installation_flat b/xCAT-test/autotest/testcase/installation/reg_linux_statelite_installation_flat
index 0baacc6be..5fef777be 100644
--- a/xCAT-test/autotest/testcase/installation/reg_linux_statelite_installation_flat
+++ b/xCAT-test/autotest/testcase/installation/reg_linux_statelite_installation_flat
@@ -4,7 +4,7 @@ label:others,provision,statelite
 #stop:yes
 cmd:fdisk -l
 cmd:df -T
-cmd:chdef $$SN -m groups=service
+cmd: if lsdef service > /dev/null 2>&1; then chdef service -m groups=service;fi
 check:rc==0
 cmd:chdef -t node -o $$CN servicenode= monserver=$$MN nfsserver=$$MN tftpserver=$$MN  xcatmaster=$$MN
 check:rc==0