diff --git a/pkgs/development/python-modules/black/default.nix b/pkgs/development/python-modules/black/default.nix
index f0a25dfb0b12..3346afbb4ab9 100644
--- a/pkgs/development/python-modules/black/default.nix
+++ b/pkgs/development/python-modules/black/default.nix
@@ -5,6 +5,7 @@
 , appdirs
 , attrs
 , click
+, dataclasses
 , mypy-extensions
 , pathspec
 , regex
@@ -59,7 +60,7 @@ buildPythonPackage rec {
     toml
     typed-ast
     typing-extensions
-  ];
+  ] ++ lib.optional (pythonOlder "3.7") dataclasses;
 
   meta = with lib; {
     description = "The uncompromising Python code formatter";