diff --git a/pkgs/development/python-modules/urllib3/default.nix b/pkgs/development/python-modules/urllib3/default.nix
index c8d98fe9307..7ee5eefb5e1 100644
--- a/pkgs/development/python-modules/urllib3/default.nix
+++ b/pkgs/development/python-modules/urllib3/default.nix
@@ -2,11 +2,11 @@
 , stdenv
 , brotli
 , buildPythonPackage
-, certifi
 , cryptography
 , dateutil
 , fetchPypi
 , idna
+, isPy27
 , mock
 , pyopenssl
 , pysocks
@@ -29,11 +29,11 @@ buildPythonPackage rec {
 
   propagatedBuildInputs = [
     brotli
-    certifi
+    pysocks
+  ] ++ lib.optionals isPy27 [
     cryptography
     idna
     pyopenssl
-    pysocks
   ];
 
   checkInputs = [