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-rw-r--r--pkgs/development/python-modules/tornado/5.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/python-modules/tornado/5.nix b/pkgs/development/python-modules/tornado/5.nix
index da270331978..74ca668de49 100644
--- a/pkgs/development/python-modules/tornado/5.nix
+++ b/pkgs/development/python-modules/tornado/5.nix
@@ -6,7 +6,7 @@
 , backports_ssl_match_hostname
 , certifi
 , singledispatch
-, futures
+, futures ? null
 , isPy27
 }: