diff --git a/lib/spack/docs/build_settings.rst b/lib/spack/docs/build_settings.rst
index 3bdeb903bdb..de580a32890 100644
--- a/lib/spack/docs/build_settings.rst
+++ b/lib/spack/docs/build_settings.rst
@@ -392,7 +392,7 @@ The following is an example of how to enforce package properties in
        require: "@1.13.2"
      openmpi:
        require:
-       - any_of: ["~cuda", "gcc"]
+       - any_of: ["~cuda", "%gcc"]
      mpich:
       require:
       - one_of: ["+cuda", "+rocm"]