diff --git a/pungi/phases/buildinstall.py b/pungi/phases/buildinstall.py
index 04e46870..a43e3707 100644
--- a/pungi/phases/buildinstall.py
+++ b/pungi/phases/buildinstall.py
@@ -368,7 +368,7 @@ def tweak_configs(path, volid, ks_file, configs=BOOT_CONFIGS, logger=None):
         # double-escape volid in yaboot.conf
         new_volid = volid_escaped_2 if "yaboot" in config else volid_escaped
 
-        ks = (" ks=hd:LABEL=%s:/ks.cfg" % new_volid) if ks_file else ""
+        ks = (" inst.ks=hd:LABEL=%s:/ks.cfg" % new_volid) if ks_file else ""
 
         # pre-f18
         data = re.sub(r":CDLABEL=[^ \n]*", r":CDLABEL=%s%s" % (new_volid, ks), data)
diff --git a/tests/test_buildinstall.py b/tests/test_buildinstall.py
index a8c3ddf7..c2051f83 100644
--- a/tests/test_buildinstall.py
+++ b/tests/test_buildinstall.py
@@ -2161,7 +2161,7 @@ class TestTweakConfigs(PungiTestCase):
         )
         for cfg in configs:
             self.assertFileContent(
-                cfg, ":LABEL=new\\x20volid ks=hd:LABEL=new\\x20volid:/ks.cfg\n"
+                cfg, ":LABEL=new\\x20volid inst.ks=hd:LABEL=new\\x20volid:/ks.cfg\n"
             )
 
     def test_tweak_configs_yaboot(self):
@@ -2173,5 +2173,5 @@ class TestTweakConfigs(PungiTestCase):
         tweak_configs(self.topdir, "new volid", os.path.join(self.topdir, "ks.cfg"))
         for cfg in configs:
             self.assertFileContent(
-                cfg, ":LABEL=new\\\\x20volid ks=hd:LABEL=new\\\\x20volid:/ks.cfg\n"
+                cfg, ":LABEL=new\\\\x20volid inst.ks=hd:LABEL=new\\\\x20volid:/ks.cfg\n"
             )