diff --git a/testcases/InstallUpstreamKernel.py b/testcases/InstallUpstreamKernel.py
index d2d42d616..0a2b7543c 100644
--- a/testcases/InstallUpstreamKernel.py
+++ b/testcases/InstallUpstreamKernel.py
@@ -128,8 +128,7 @@ def is_url(path):
             time.sleep(10)
             if not self.use_kexec:
                 # FIXME: Handle distributions which do not support grub
-                con.run_command(
-                    "grub2-mkconfig  --output=/boot/grub2/grub.cfg")
+                con.run_command("grubby --set-default /boot/vmlinuz-%s" % res[-1])
                 log.debug("Rebooting after kernel install...")
                 self.console_thread.console_terminate()
                 con.close()