diff --git a/xCAT-client-2.0/bin/prsync b/xCAT-client-2.0/bin/prsync
index 1c072c87e..fe7cec55e 100755
--- a/xCAT-client-2.0/bin/prsync
+++ b/xCAT-client-2.0/bin/prsync
@@ -14,7 +14,7 @@ use Data::Dumper;
 use IO::Handle;
 use IO::Select;
 use xCAT::Utils;
-#use Threads qw(yield);
+use Thread qw(yield);
 use Getopt::Long;
 use POSIX qw(:signal_h :errno_h :sys_wait_h);
 my $interface;
diff --git a/xCAT-client-2.0/bin/pscp b/xCAT-client-2.0/bin/pscp
index 55b74d03a..0db720f80 100755
--- a/xCAT-client-2.0/bin/pscp
+++ b/xCAT-client-2.0/bin/pscp
@@ -13,7 +13,7 @@ if ($^O =~ /^linux/i) {
 use Data::Dumper;
 use IO::Handle;
 use IO::Select;
-#use Threads qw(yield);
+use Thread qw(yield);
 use xCAT::Utils;
 use Getopt::Long;
 use POSIX qw(:signal_h :errno_h :sys_wait_h);