diff --git a/pkgs/development/libraries/libvncserver/default.nix b/pkgs/development/libraries/libvncserver/default.nix
index 35adb4600414..da9e1dc31482 100644
--- a/pkgs/development/libraries/libvncserver/default.nix
+++ b/pkgs/development/libraries/libvncserver/default.nix
@@ -3,6 +3,9 @@
   xextproto, libXext, fixesproto, libXfixes, xineramaproto, libXinerama, 
   libXrandr, randrproto, libXtst, zlib
 }:
+
+assert stdenv.isLinux;
+
 let
   s = # Generated upstream information
   rec {