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-rw-r--r--nixpkgs/pkgs/development/python-modules/tornado/5.nix10
1 files changed, 5 insertions, 5 deletions
diff --git a/nixpkgs/pkgs/development/python-modules/tornado/5.nix b/nixpkgs/pkgs/development/python-modules/tornado/5.nix
index da270331978d..2905f89dc0cc 100644
--- a/nixpkgs/pkgs/development/python-modules/tornado/5.nix
+++ b/nixpkgs/pkgs/development/python-modules/tornado/5.nix
@@ -2,11 +2,11 @@
 , python
 , buildPythonPackage
 , fetchPypi
-, backports_abc
-, backports_ssl_match_hostname
-, certifi
-, singledispatch
-, futures
+, backports_abc ? null
+, backports_ssl_match_hostname ? null
+, certifi ? null
+, singledispatch ? null
+, futures ? null
 , isPy27
 }: