diff --git a/xCAT-test/autotest/testcase/installation/Full_installation_flat_p8_le b/xCAT-test/autotest/testcase/installation/Full_installation_flat_p8_le
index a058f5560..447f4a4fa 100644
--- a/xCAT-test/autotest/testcase/installation/Full_installation_flat_p8_le
+++ b/xCAT-test/autotest/testcase/installation/Full_installation_flat_p8_le
@@ -25,7 +25,8 @@ cmd:makeconservercf $$CN
 check:rc==0
 cmd:cat /etc/conserver.cf | grep $$CN
 check:output=~$$CN
-cmd:chdef -t node -o $$CN postscripts=setupntp
+cmd:if [ "__GETNODEATTR($$CN,os)__" != "sles12.1" ];then chdef -t node -o $$CN postscripts=setupntp; fi
+cmd:lsdef -l $$CN
 check:rc==0
 cmd:nodeset $$CN osimage=__GETNODEATTR($$CN,os)__-__GETNODEATTR($$CN,arch)__-install-compute
 check:rc==0
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 b9c7d65bf..dfbab0873 100644
--- a/xCAT-test/autotest/testcase/installation/reg_linux_diskfull_installation_flat
+++ b/xCAT-test/autotest/testcase/installation/reg_linux_diskfull_installation_flat
@@ -33,7 +33,8 @@ check:rc==0
 check:output=~$$CN
 cmd:copycds $$ISO 
 check:rc==0
-cmd:chdef -t node -o $$CN postscripts=setupntp
+cmd:if [ "__GETNODEATTR($$CN,os)__" != "sles12.1" ];then chdef -t node -o $$CN postscripts=setupntp; fi
+cmd:lsdef -l $$CN
 check:rc==0
 cmd:nodeset $$CN osimage=__GETNODEATTR($$CN,os)__-__GETNODEATTR($$CN,arch)__-install-compute
 check:rc==0