diff --git a/pkgs/development/python-modules/psutil/default.nix b/pkgs/development/python-modules/psutil/default.nix
index 8e479dfaca2..69181af222c 100644
--- a/pkgs/development/python-modules/psutil/default.nix
+++ b/pkgs/development/python-modules/psutil/default.nix
@@ -16,7 +16,7 @@ buildPythonPackage rec {
 
   # arch doesn't report frequency is the same way
   # tests segfaults on darwin https://github.com/giampaolo/psutil/issues/1715
-  doCheck = stdenv.isDarwin || stdenv.isx86_64;
+  doCheck = !stdenv.isDarwin && stdenv.isx86_64;
   checkInputs = [ pytest ]
     ++ lib.optionals isPy27 [ mock ipaddress ];
   # out must be referenced as test import paths are relative