diff --git a/perl-xCAT/xCAT/Common.pm b/perl-xCAT/xCAT/Common.pm
index 0d2e42fb2..6131878c9 100644
--- a/perl-xCAT/xCAT/Common.pm
+++ b/perl-xCAT/xCAT/Common.pm
@@ -6,6 +6,7 @@ package xCAT::Common;
 
 use File::stat;
 use File::Copy;
+use Thread qw/yield/;
 
 BEGIN
 {
@@ -42,7 +43,7 @@ sub forward_data {
       close($rfh);
     }
   }
-  yield; #Try to avoid useless iterations as much as possible
+  yield(); #Try to avoid useless iterations as much as possible
   return $rc;
 }
 
diff --git a/xCAT-server/lib/xcat/plugins/esx.pm b/xCAT-server/lib/xcat/plugins/esx.pm
index 2f91ea743..528fba832 100644
--- a/xCAT-server/lib/xcat/plugins/esx.pm
+++ b/xCAT-server/lib/xcat/plugins/esx.pm
@@ -2277,7 +2277,7 @@ sub  makecustomizedmod {
     close($shadow);
     if (-e "$::XCATROOT/share/xcat/netboot/esxi/47.xcat-networking") {
         mkpath($tempdir."/etc/vmware/init/init.d");
-        copy( "$::XCATROOT/share/xcat/netboot/esxi/47.xcat-networking",$tempdir."/etc/vmware/init/init.d/47.xcat-networking"
+        copy( "$::XCATROOT/share/xcat/netboot/esxi/47.xcat-networking",$tempdir."/etc/vmware/init/init.d/47.xcat-networking");
     }
     #TODO: auto-enable ssh and request boot-time customization rather than on-demand?
     require Cwd;