diff --git a/flake.nix b/flake.nix
index 372983f6d..d18646415 100644
--- a/flake.nix
+++ b/flake.nix
@@ -385,7 +385,7 @@
               nix = pkgs.callPackage ./package.nix {
                 inherit stdenv officialRelease versionSuffix;
                 busybox-sandbox-shell = pkgs.busybox-sandbox-shell or pkgs.default-busybox-sandbox;
-                internalApiDocs = true;
+                internalApiDocs = false;
               };
               pre-commit = self.hydraJobs.pre-commit.${pkgs.system} or { };
             in
diff --git a/package.nix b/package.nix
index 988379618..0ade925ce 100644
--- a/package.nix
+++ b/package.nix
@@ -392,6 +392,7 @@ stdenv.mkDerivation (finalAttrs: {
         bashInteractive,
         clang-tools,
         clangbuildanalyzer,
+        doxygen,
         glibcLocales,
         just,
         llvmPackages,
@@ -457,6 +458,10 @@ stdenv.mkDerivation (finalAttrs: {
               skopeo
               just
               nixfmt
+              # Included above when internalApiDocs is true, but we set that to
+              # false intentionally to save dev build time.
+              # To build them in a dev shell, you can set -Dinternal-api-docs=enabled when configuring.
+              doxygen
               # Load-bearing order. Must come before clang-unwrapped below, but after clang_tools above.
               stdenv.cc
             ]