diff --git a/pkgs/development/python-modules/notebook/default.nix b/pkgs/development/python-modules/notebook/default.nix
index 3fb8ace4084..116fa153cda 100644
--- a/pkgs/development/python-modules/notebook/default.nix
+++ b/pkgs/development/python-modules/notebook/default.nix
@@ -67,6 +67,7 @@ buildPythonPackage rec {
     "TestInstallServerExtension"
     "launch_socket"
     "sock_server"
+    "test_list_formats" # tries to find python MIME type
   ] ++ lib.optional stdenv.isDarwin [
     "test_delete"
     "test_checkpoints_follow_file"