diff --git a/pkgs/development/python-modules/graphene/default.nix b/pkgs/development/python-modules/graphene/default.nix
index bf7d08cdce3..2839fc337cd 100644
--- a/pkgs/development/python-modules/graphene/default.nix
+++ b/pkgs/development/python-modules/graphene/default.nix
@@ -2,7 +2,6 @@
 , buildPythonPackage
 , fetchFromGitHub
 , aniso8601
-, iso8601
 , graphql-core
 , graphql-relay
 , promise