diff --git a/pkgs/development/python-modules/aiohttp/default.nix b/pkgs/development/python-modules/aiohttp/default.nix
index 660e205fb482..bca1f6002f4e 100644
--- a/pkgs/development/python-modules/aiohttp/default.nix
+++ b/pkgs/development/python-modules/aiohttp/default.nix
@@ -67,6 +67,9 @@ buildPythonPackage rec {
     pytest-mock
     pytestCheckHook
     re-assert
+  ] ++ lib.optionals (!(stdenv.isDarwin && stdenv.isAarch64)) [
+    # Optional test dependency. Depends indirectly on pyopenssl, which is
+    # broken on aarch64-darwin.
     trustme
   ];