diff --git a/pkgs/development/python-modules/xcffib/default.nix b/pkgs/development/python-modules/xcffib/default.nix
index b0b00da0dc32..ff5215ccb4cc 100644
--- a/pkgs/development/python-modules/xcffib/default.nix
+++ b/pkgs/development/python-modules/xcffib/default.nix
@@ -47,11 +47,15 @@ buildPythonPackage rec {
     "xcffib"
   ];
 
+  # Tests use xvfb
+  __darwinAllowLocalNetworking = true;
+
   meta = with lib; {
     description = "A drop in replacement for xpyb, an XCB python binding";
     homepage = "https://github.com/tych0/xcffib";
     changelog = "https://github.com/tych0/xcffib/releases/tag/v${version}";
     license = licenses.asl20;
+    platforms = platforms.linux ++ platforms.darwin ++ platforms.windows;
     maintainers = with maintainers; [ kamilchm ];
   };
 }