diff --git a/confluent_osdeploy/confluent_osdeploy.spec.tmpl b/confluent_osdeploy/confluent_osdeploy.spec.tmpl
index 4bc123fe..5005bcbf 100644
--- a/confluent_osdeploy/confluent_osdeploy.spec.tmpl
+++ b/confluent_osdeploy/confluent_osdeploy.spec.tmpl
@@ -39,8 +39,8 @@ cd esxi7out
 cp -a ../opt .
 cp -a ../esxi7/initramfs/* .
 chmod +x bin/* opt/confluent/bin/*
-tar zcvf ../addons.tgz *
-mv ../addons.tgz .
+tar cf ../addons.tar *
+mv ../addons.tar .
 cd ..
 
 %install
diff --git a/confluent_server/bin/osimage b/confluent_server/bin/osimage
index 9349c62a..a29f1083 100644
--- a/confluent_server/bin/osimage
+++ b/confluent_server/bin/osimage
@@ -137,11 +137,11 @@ def initialize(cmdset):
             sys.stderr.write('Error occurred while packing site initramfs')
             sys.exit(1)
     os.rename(tmpname, '/var/lib/confluent/public/site/initramfs.cpio')
-    tmptarname = tmpname.replace('cpio', 'tgz')
-    tarcmd = ['tar', '--transform=s|^|etc/|', '-czf', tmptarname] + topack
+    tmptarname = tmpname.replace('cpio', 'tar')
+    tarcmd = ['tar', '--transform=s|^|etc/|', '-cf', tmptarname] + topack
     subprocess.check_call(tarcmd)
     os.chdir(opath)
-    os.rename(tmptarname, '/var/lib/confluent/public/site/initramfs.tgz')
+    os.rename(tmptarname, '/var/lib/confluent/public/site/initramfs.tar')
     if cmdset.k:
         with open('/etc/ssh/ssh_known_hosts', 'a+b') as skh:
             for cafile in glob.glob('/var/lib/confluent/public/site/ssh/*.ca'):
diff --git a/confluent_server/confluent/osimage.py b/confluent_server/confluent/osimage.py
index 87aecaa5..0852f8c6 100644
--- a/confluent_server/confluent/osimage.py
+++ b/confluent_server/confluent/osimage.py
@@ -71,14 +71,14 @@ def update_boot_esxi(profiledir, profile, label):
         elif cfgline.startswith('modules='):
             modlist = cfgline.split('=', 1)[1]
             filesneeded.extend(modlist.split(' --- '))
-            newbootcfg += cfgline + ' --- /initramfs/addons.tgz --- /site.tgz\n'
+            newbootcfg += cfgline + ' --- /initramfs/addons.tar --- /site.tar\n'
         else:
             newbootcfg += cfgline + '\n'
     os.makedirs('{0}/boot/efi/boot/'.format(profiledir))
     with open('{0}/boot/efi/boot/BOOT.CFG'.format(profiledir), 'w+') as bcfg:
         bcfg.write(newbootcfg)
-    os.symlink('/var/lib/confluent/public/site/initramfs.tgz',
-               '{0}/boot/site.tgz'.format(profiledir))
+    os.symlink('/var/lib/confluent/public/site/initramfs.tar',
+               '{0}/boot/site.tar'.format(profiledir))
     for fn in filesneeded:
         if fn.startswith('/'):
             fn = fn[1:]