diff --git a/pkgs/os-specific/darwin/apple-sdk/frameworks.nix b/pkgs/os-specific/darwin/apple-sdk/frameworks.nix
index 3ecb3511422..9a3c3c556e3 100644
--- a/pkgs/os-specific/darwin/apple-sdk/frameworks.nix
+++ b/pkgs/os-specific/darwin/apple-sdk/frameworks.nix
@@ -104,6 +104,7 @@ with frameworks; with libs; {
   VideoDecodeAcceleration = [ CF CoreVideo ];
   VideoToolbox            = [ CF CoreMedia CoreVideo ];
   WebKit                  = [ ApplicationServices Carbon JavaScriptCore OpenGL ];
+  X11                     = []; # used by Tk, should this exist?
 
   # Umbrellas
   Accelerate          = [ CoreWLAN IOBluetooth ];