diff --git a/var/spack/repos/builtin/packages/cairo/package.py b/var/spack/repos/builtin/packages/cairo/package.py
index 8f471a3cacc..e2b9b2178be 100644
--- a/var/spack/repos/builtin/packages/cairo/package.py
+++ b/var/spack/repos/builtin/packages/cairo/package.py
@@ -2,6 +2,8 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
+import spack.build_systems.autotools
+import spack.build_systems.meson
 from spack.package import *