diff --git a/package b/package
index ff5df1b..72472e1 100755
--- a/package
+++ b/package
@@ -102,7 +102,8 @@ if __name__ == "__main__":
       cb_hooks_env = os.environ.copy()
       cb_hooks_env["PATH"] = os.environ['PATH'] + ':' + local_acbuild_dir
       cb_hooks_env["TAMARIN_ACBUILD"] = " ".join([system.which('acbuild', local_acbuild_dir)]+acbuild_flags)
-      cb_hooks_env["TAMARIN_ACBUILD_ENGINE"] = "chroot" if system.which('systemd-nspawn') == "" else "systemd-nspawn"
+      cb_hooks_env["TAMARIN_ACBUILD_ENGINE"] = "chroot" if not system.which('systemctl') else "systemd-nspawn"
+
       tamarin.run_profile_hooks(profile, 'containerbuild', cwd=build_workspace, env=cb_hooks_env)
 
       # Cache image