diff --git a/pkgs/development/compilers/llvm/3.5/llvm.nix b/pkgs/development/compilers/llvm/3.5/llvm.nix
index c1b2d69c5da0..00de67c60529 100644
--- a/pkgs/development/compilers/llvm/3.5/llvm.nix
+++ b/pkgs/development/compilers/llvm/3.5/llvm.nix
@@ -42,9 +42,11 @@ in stdenv.mkDerivation rec {
     "-DLLVM_BUILD_TESTS=ON"
     "-DLLVM_ENABLE_FFI=ON"
     "-DLLVM_BINUTILS_INCDIR=${binutils}/include"
-    "-DCMAKE_CXX_FLAGS=-stdlib=libc++"
   ] ++ stdenv.lib.optional (!isDarwin) "-DBUILD_SHARED_LIBS=ON"
-    ++ stdenv.lib.optional ( isDarwin) "-DCAN_TARGET_i386=false";
+    ++ stdenv.lib.optionals ( isDarwin) [
+    "-DCMAKE_CXX_FLAGS=-stdlib=libc++"
+    "-DCAN_TARGET_i386=false"
+  ];
 
   postBuild = ''
     rm -fR $out