diff --git a/xCAT/postscripts/lsf_startup b/xCAT/postscripts/lsf_startup
index 93c539b3d..a8dd3bee9 100644
--- a/xCAT/postscripts/lsf_startup
+++ b/xCAT/postscripts/lsf_startup
@@ -59,13 +59,18 @@ for lsfnode in $ALL_LSF_NODES
 do
     if [[ x${lsfnode} == x$NODE ]]
     then
-
         if [[ -f /root/.bash_profile ]] 
-        then 
-
-            echo ". $LSF_TOP/conf/profile.lsf" >> /root/.bash_profile
+        then
+            if ! grep -q -i "#Added by lsf_startup" /root/.bash_profile ; then 
+                echo "#Added by lsf_startup."
+                echo ". $LSF_TOP/conf/profile.lsf" >> /root/.bash_profile
+            fi
         else
-            echo ". $LSF_TOP/conf/profile.lsf" >> /root/.profile
+            if ! grep -q -i "#Added by lsf_startup" /root/.profile ; then
+                echo "#Added by lsf_startup."
+                echo ". $LSF_TOP/conf/profile.lsf" >> /root/.profile
+            fi
+            
         fi
     fi
 done