diff --git a/pkgs/development/compilers/ghc/6.10.1-binary.nix b/pkgs/development/compilers/ghc/6.10.1-binary.nix
index dd6e7890e1df..89ebfb0dc135 100644
--- a/pkgs/development/compilers/ghc/6.10.1-binary.nix
+++ b/pkgs/development/compilers/ghc/6.10.1-binary.nix
@@ -1,5 +1,7 @@
 {stdenv, fetchurl, perl, libedit, ncurses, gmp}:
 
+assert stdenv.system == "i686-darwin" || stdenv.system == "x86_64-linux" || stdenv.system == "i686-linux";
+
 stdenv.mkDerivation rec {
   version = "6.10.1";
 
diff --git a/pkgs/development/compilers/ghc/6.10.2-binary.nix b/pkgs/development/compilers/ghc/6.10.2-binary.nix
index e00702b8d840..85c678ffbfba 100644
--- a/pkgs/development/compilers/ghc/6.10.2-binary.nix
+++ b/pkgs/development/compilers/ghc/6.10.2-binary.nix
@@ -1,5 +1,7 @@
 {stdenv, fetchurl, perl, libedit, ncurses, gmp}:
 
+assert stdenv.system == "i686-darwin" || stdenv.system == "x86_64-linux" || stdenv.system == "i686-linux";
+
 stdenv.mkDerivation rec {
   version = "6.10.2";
 
diff --git a/pkgs/development/compilers/ghc/6.4.2-binary.nix b/pkgs/development/compilers/ghc/6.4.2-binary.nix
index 31777244521a..b20b7369d301 100644
--- a/pkgs/development/compilers/ghc/6.4.2-binary.nix
+++ b/pkgs/development/compilers/ghc/6.4.2-binary.nix
@@ -1,5 +1,7 @@
 {stdenv, fetchurl, perl, readline, ncurses, gmp}:
 
+assert stdenv.system == "i686-darwin" || stdenv.system == "x86_64-linux" || stdenv.system == "i686-linux";
+
 stdenv.mkDerivation {
   name = if stdenv.system == "i686-darwin" then "ghc-6.6.1-binary" else "ghc-6.4.2-binary";