diff --git a/pkgs/development/compilers/llvm/3.4/lld.nix b/pkgs/development/compilers/llvm/3.4/lld.nix
index 22eb02a0e35b..c28c03fbdd1d 100644
--- a/pkgs/development/compilers/llvm/3.4/lld.nix
+++ b/pkgs/development/compilers/llvm/3.4/lld.nix
@@ -8,7 +8,7 @@ stdenv.mkDerivation {
   preUnpack = ''
     # !!! Hopefully won't be needed for 3.5
     unpackFile ${llvm.src}
-    export cmakeFlags="$cmakeFlags -DLLD_PATH_TO_LLVM_SOURCE=$PWD/llvm-${version}"
+    export cmakeFlags="$cmakeFlags -DLLD_PATH_TO_LLVM_SOURCE="`ls -d $PWD/llvm-*`
   '';
 
   buildInputs = [ cmake ncurses zlib python ];