diff --git a/pkgs/applications/science/electronics/tkgate/1.x.nix b/pkgs/applications/science/electronics/tkgate/1.x.nix
index 97806f7662a..7c04c85fdb7 100644
--- a/pkgs/applications/science/electronics/tkgate/1.x.nix
+++ b/pkgs/applications/science/electronics/tkgate/1.x.nix
@@ -1,5 +1,7 @@
 { stdenv, fetchurl, tcl, tk, libX11, libiconvOrLibc, which, yacc, flex, imake, xproto, gccmakedep }:
 
+assert stdenv.system == "i686-linux" || stdenv.system == "x86_64-linux";
+
 stdenv.mkDerivation rec {
   name = "tkgate-1.8.7";
 
diff --git a/pkgs/applications/science/electronics/tkgate/2.x.nix b/pkgs/applications/science/electronics/tkgate/2.x.nix
index 608a2f890ab..756fe7052d8 100644
--- a/pkgs/applications/science/electronics/tkgate/2.x.nix
+++ b/pkgs/applications/science/electronics/tkgate/2.x.nix
@@ -1,5 +1,7 @@
 { stdenv, fetchurl, tcl, tk, libX11, libiconvOrLibc }:
 
+assert stdenv.system == "i686-linux" || stdenv.system == "x86_64-linux";
+
 stdenv.mkDerivation rec {
   name = "tkgate-2.0-b10";