diff --git a/pkgs/development/compilers/llvm/3.4/llvm.nix b/pkgs/development/compilers/llvm/3.4/llvm.nix
index 27047e7d941c..30f2dba28831 100644
--- a/pkgs/development/compilers/llvm/3.4/llvm.nix
+++ b/pkgs/development/compilers/llvm/3.4/llvm.nix
@@ -90,6 +90,6 @@ in stdenv.mkDerivation rec {
     homepage    = http://llvm.org/;
     license     = stdenv.lib.licenses.ncsa;
     maintainers = with stdenv.lib.maintainers; [ lovek323 raskin viric ];
-    platforms   = stdenv.lib.platforms.all;
+    platforms = [ "i686-linux" "x86_64-linux" "x86_64-darwin"];
   };
 }
diff --git a/pkgs/development/compilers/llvm/3.5/llvm.nix b/pkgs/development/compilers/llvm/3.5/llvm.nix
index 00b2548d56e6..4d0cb8930f57 100644
--- a/pkgs/development/compilers/llvm/3.5/llvm.nix
+++ b/pkgs/development/compilers/llvm/3.5/llvm.nix
@@ -98,7 +98,7 @@ in stdenv.mkDerivation rec {
     homepage    = http://llvm.org/;
     license     = stdenv.lib.licenses.ncsa;
     maintainers = with stdenv.lib.maintainers; [ lovek323 raskin viric ];
-    platforms   = stdenv.lib.platforms.all;
+    platforms = [ "i686-linux" "x86_64-linux" "x86_64-darwin"];
   };
 }