diff --git a/pkgs/development/compilers/ghcjs-ng/default.nix b/pkgs/development/compilers/ghcjs-ng/default.nix
index 04c3431f6f2..6e883aeafe8 100644
--- a/pkgs/development/compilers/ghcjs-ng/default.nix
+++ b/pkgs/development/compilers/ghcjs-ng/default.nix
@@ -50,7 +50,7 @@ let
   };
 
   bootGhcjs = haskellLib.justStaticExecutables passthru.bootPkgs.ghcjs;
-  libexec = "${bootGhcjs}/libexec/${builtins.replaceStrings ["darwin"] ["osx"] stdenv.system}-${passthru.bootPkgs.ghc.name}/${bootGhcjs.name}";
+  libexec = "${bootGhcjs}/libexec/${builtins.replaceStrings ["darwin" "i686"] ["osx" "i386"] stdenv.system}-${passthru.bootPkgs.ghc.name}/${bootGhcjs.name}";
 
 in stdenv.mkDerivation {
     name = bootGhcjs.name;