diff --git a/pkgs/development/python-modules/pydantic/default.nix b/pkgs/development/python-modules/pydantic/default.nix
index a1f567adcd59..d24928092f92 100644
--- a/pkgs/development/python-modules/pydantic/default.nix
+++ b/pkgs/development/python-modules/pydantic/default.nix
@@ -11,7 +11,8 @@
 , pythonOlder
 , typing-extensions
 # dependencies for building documentation.
-, withDocs ? (stdenv.hostPlatform == stdenv.buildPlatform)
+# docs fail to build in Darwin sandbox: https://github.com/samuelcolvin/pydantic/issues/4245
+, withDocs ? (stdenv.hostPlatform == stdenv.buildPlatform && !stdenv.isDarwin)
 , ansi2html
 , markdown-include
 , mkdocs