diff --git a/xCAT-test/unit/sles_genesis_boot_files.t b/xCAT-test/unit/sles_genesis_boot_files.t
index cc062689e..061097249 100644
--- a/xCAT-test/unit/sles_genesis_boot_files.t
+++ b/xCAT-test/unit/sles_genesis_boot_files.t
@@ -6,6 +6,7 @@ use File::Path qw(make_path);
 use File::Temp qw(tempdir);
 use FindBin;
 use Test::More;
+use Time::HiRes qw(sleep);
 
 BEGIN {
     $ENV{XCATROOT} = "$FindBin::Bin/../../xCAT-server";
@@ -31,7 +32,7 @@ my $kernel = "$tftp/xcat/genesis.kernel.x86_64";
 my $lzma = "$tftp/xcat/genesis.fs.x86_64.lzma";
 my $gzip = "$tftp/xcat/genesis.fs.x86_64.gz";
 write_file($_) for ($kernel, $lzma);
-select(undef, undef, undef, 1.1);
+sleep(1.1);
 write_file($gzip);
 
 my ($selected_kernel, $selected_initrd) =
@@ -41,7 +42,7 @@ is($selected_kernel, 'genesis.kernel.x86_64',
 is($selected_initrd, 'genesis.fs.x86_64.gz',
     'SLES selects the newer gzip initramfs');
 
-select(undef, undef, undef, 1.1);
+sleep(1.1);
 write_file($lzma);
 ($selected_kernel, $selected_initrd) =
   xCAT_plugin::sles::_find_genesis_boot_files($tftp, 'x86_64');