diff --git a/pkgs/development/compilers/ghc/6.10.1-binary.nix b/pkgs/development/compilers/ghc/6.10.1-binary.nix
index 5a15cc0dff7..353a4176ea4 100644
--- a/pkgs/development/compilers/ghc/6.10.1-binary.nix
+++ b/pkgs/development/compilers/ghc/6.10.1-binary.nix
@@ -1,11 +1,5 @@
 {stdenv, fetchurl, perl, libedit, ncurses, gmp}:
 
-let
-  supportedPlatforms = ["i686-darwin" "x86_64-linux" "i686-linux"];
-in
-
-assert stdenv.lib.elem stdenv.system supportedPlatforms;
-
 stdenv.mkDerivation rec {
   version = "6.10.1";
 
@@ -104,5 +98,5 @@ stdenv.mkDerivation rec {
         [ $(./main) == "yes" ]
       '';
 
-  meta.platforms = supportedPlatforms;
+  meta.platforms = ["i686-darwin" "x86_64-linux" "i686-linux"];
 }
diff --git a/pkgs/development/compilers/ghc/6.10.2-binary.nix b/pkgs/development/compilers/ghc/6.10.2-binary.nix
index 616c9de7ede..02f1db354a1 100644
--- a/pkgs/development/compilers/ghc/6.10.2-binary.nix
+++ b/pkgs/development/compilers/ghc/6.10.2-binary.nix
@@ -1,11 +1,5 @@
 {stdenv, fetchurl, perl, libedit, ncurses, gmp}:
 
-let
-  supportedPlatforms = ["x86_64-linux" "i686-linux"];
-in
-
-assert stdenv.lib.elem stdenv.system supportedPlatforms;
-
 stdenv.mkDerivation rec {
   version = "6.10.2";
 
@@ -103,5 +97,5 @@ stdenv.mkDerivation rec {
         [ $(./main) == "yes" ]
       '';
 
-  meta.platforms = supportedPlatforms;
+  meta.platforms = ["x86_64-linux" "i686-linux"];
 }
diff --git a/pkgs/development/compilers/ghc/6.12.1-binary.nix b/pkgs/development/compilers/ghc/6.12.1-binary.nix
index a84b75d705b..23486b5f4fa 100644
--- a/pkgs/development/compilers/ghc/6.12.1-binary.nix
+++ b/pkgs/development/compilers/ghc/6.12.1-binary.nix
@@ -1,11 +1,5 @@
 {stdenv, fetchurl, perl, ncurses, gmp}:
 
-let
-  supportedPlatforms = ["x86_64-linux" "i686-linux"];
-in
-
-assert stdenv.lib.elem stdenv.system supportedPlatforms;
-
 stdenv.mkDerivation rec {
   version = "6.12.1";
 
@@ -105,5 +99,5 @@ stdenv.mkDerivation rec {
         [ $(./main) == "yes" ]
       '';
 
-  meta.platforms = supportedPlatforms;
+  meta.platforms = ["x86_64-linux" "i686-linux"];
 }
diff --git a/pkgs/development/compilers/ghc/6.4.2-binary.nix b/pkgs/development/compilers/ghc/6.4.2-binary.nix
index 2ed6f2be4fe..1a5bf059e9f 100644
--- a/pkgs/development/compilers/ghc/6.4.2-binary.nix
+++ b/pkgs/development/compilers/ghc/6.4.2-binary.nix
@@ -1,11 +1,5 @@
 {stdenv, fetchurl, perl, readline, ncurses, gmp}:
 
-let
-  supportedPlatforms = ["i686-darwin" "x86_64-linux" "i686-linux"];
-in
-
-assert stdenv.lib.elem stdenv.system supportedPlatforms;
-
 stdenv.mkDerivation {
   name = if stdenv.system == "i686-darwin" then "ghc-6.6.1-binary" else "ghc-6.4.2-binary";
 
@@ -68,5 +62,5 @@ stdenv.mkDerivation {
 
   '' else "";
 
-  meta.platforms = supportedPlatforms;
+  meta.platforms = ["i686-darwin" "x86_64-linux" "i686-linux"];
 }
diff --git a/pkgs/development/compilers/ghc/7.0.4-binary.nix b/pkgs/development/compilers/ghc/7.0.4-binary.nix
index 0baf9718f85..0bfc81a17a4 100644
--- a/pkgs/development/compilers/ghc/7.0.4-binary.nix
+++ b/pkgs/development/compilers/ghc/7.0.4-binary.nix
@@ -1,11 +1,5 @@
 {stdenv, fetchurl, perl, ncurses, gmp}:
 
-let
-  supportedPlatforms = ["x86_64-linux" "i686-linux" "i686-darwin" "x86_64-darwin"];
-in
-
-assert stdenv.lib.elem stdenv.system supportedPlatforms;
-
 stdenv.mkDerivation rec {
   version = "7.0.4";
 
@@ -93,5 +87,5 @@ stdenv.mkDerivation rec {
         [ $(./main) == "yes" ]
       '';
 
-  meta.platforms = supportedPlatforms;
+  meta.platforms = ["x86_64-linux" "i686-linux" "i686-darwin" "x86_64-darwin"];
 }
diff --git a/pkgs/development/compilers/ghc/7.4.2-binary.nix b/pkgs/development/compilers/ghc/7.4.2-binary.nix
index 85e10d7090c..e0a8fee4b66 100644
--- a/pkgs/development/compilers/ghc/7.4.2-binary.nix
+++ b/pkgs/development/compilers/ghc/7.4.2-binary.nix
@@ -1,11 +1,5 @@
 {stdenv, fetchurl, perl, ncurses, gmp}:
 
-let
-  supportedPlatforms = ["x86_64-linux" "i686-linux" "i686-darwin" "x86_64-darwin"];
-in
-
-assert stdenv.lib.elem stdenv.system supportedPlatforms;
-
 stdenv.mkDerivation rec {
   version = "7.4.2";
 
@@ -93,5 +87,5 @@ stdenv.mkDerivation rec {
         [ $(./main) == "yes" ]
       '';
 
-  meta.platforms = supportedPlatforms;
+  meta.platforms = ["x86_64-linux" "i686-linux" "i686-darwin" "x86_64-darwin"];
 }