diff --git a/pkgs/development/python-modules/diff_cover/default.nix b/pkgs/development/python-modules/diff_cover/default.nix
index 03b1f4fa28e..91832bc88ff 100644
--- a/pkgs/development/python-modules/diff_cover/default.nix
+++ b/pkgs/development/python-modules/diff_cover/default.nix
@@ -6,7 +6,6 @@
 , six
 # test dependencies
 , coverage
-, flake8
 , mock
 , nose
 , pycodestyle