diff --git a/pkgs/development/python-modules/cassandra-driver/default.nix b/pkgs/development/python-modules/cassandra-driver/default.nix
index 215b3b7ac6c..55468ba0fdf 100644
--- a/pkgs/development/python-modules/cassandra-driver/default.nix
+++ b/pkgs/development/python-modules/cassandra-driver/default.nix
@@ -38,7 +38,7 @@ buildPythonPackage rec {
 
   # Make /etc/protocols accessible to allow socket.getprotobyname('tcp') in sandbox,
   # also /etc/resolv.conf is referenced by some tests
-  preCheck = (stdenv.lib.optionalString stdenv.isLinux ''
+  preCheck = (lib.optionalString stdenv.isLinux ''
     echo "nameserver 127.0.0.1" > resolv.conf
     export NIX_REDIRECTS=/etc/protocols=${iana-etc}/etc/protocols:/etc/resolv.conf=$(realpath resolv.conf)
     export LD_PRELOAD=${libredirect}/lib/libredirect.so