diff --git a/mix.exs b/mix.exs
index eb77a15..981fdb3 100644
--- a/mix.exs
+++ b/mix.exs
@@ -14,7 +14,7 @@ defmodule SEO.MixProject do
       elixir: ">= 1.17.0",
       start_permanent: Mix.env() == :prod,
       elixirc_paths: elixirc_paths(Mix.env()),
-      compilers: Mix.compilers() ++ [:seo_jsonld],
+      compilers: compilers(Mix.env()),
       aliases: aliases(),
       deps: deps(),
       docs: docs(),
@@ -31,6 +31,14 @@ defmodule SEO.MixProject do
     [preferred_envs: [tests: :test]]
   end
 
+  # `:seo_jsonld` materializes the SEO.JSONLD.* modules for THIS library's own
+  # ExDoc site (:dev) and tests (:test). Dependencies always compile in :prod,
+  # so gating it out of :prod is what keeps those generated modules from landing
+  # in consumers' builds — where they'd clash with a consumer that also runs the
+  # compiler. See config/config.exs for the `:all` vocabulary used here.
+  defp compilers(:prod), do: Mix.compilers()
+  defp compilers(_), do: Mix.compilers() ++ [:seo_jsonld]
+
   # Run "mix help compile.app" to learn about applications.
   def application do
     [