diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index e8aafa0e2f8e..782acbdf3c4c 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -5994,7 +5994,7 @@ let
       md5 = "50b02560a49fe928c90c53a49791f621";
     };
 
-    buildInputs = with self; [ tornado requests httplib2 sure nose coverage ];
+    buildInputs = with self; [ tornado requests httplib2 sure nose coverage certifi ];
 
     propagatedBuildInputs = with self; [ urllib3 ];